Can you state what a whole passage is saying and reject the tempting options that only cover part of it? This lesson test answers that with 28 original passages and questions in the ASVAB Paragraph Comprehension style, covering stated and implied main ideas, contrast passages and claims with careful qualifiers.
Warehouse workers who stretch for five minutes before a shift are less likely to strain their backs and shoulders. Loosening tight muscles prepares them for the lifting, reaching, and twisting the job requires. At one distribution center, supervisors now lead a short stretching routine at the start of every shift, and workers say they feel less stiff by the end of the day.
What is the main idea of the passage?
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Answer: D
Correct answer: A short pre-shift stretch can help warehouse workers avoid strains. The first sentence states the claim, and every later sentence supports it: one explains why stretching helps and one gives an example of a workplace that uses it. The answer that restates that opening claim covers the whole passage.
A: This is too broad; the passage discusses only stretching for warehouse workers.
B: This is a supporting example from the last sentence, not the point the whole passage makes.
C: This detail explains why stretching helps, but it says nothing about stretching itself.
D (correct): This restates the opening claim, and the sentences about loosening muscles and the supervised routine both support it.
Question 2 of 28 · easy
The public library on Elm Street now lends out tools and kitchen gadgets along with books. With a library card, residents can borrow a power drill, a ladder, a tile cutter, or a bread machine for one week at no cost. Library staff started the program after hearing that many patrons put off small repairs because they could not afford equipment they would use only once or twice.
Which statement best expresses the main idea of the passage, rather than just its topic?
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Answer: B
Correct answer: A library tool program lets residents borrow equipment instead of buying it. A topic answers "about what?" while a main idea also answers "so what?" The passage is about a library's tool program, and its point is that residents can borrow equipment for projects instead of paying for it.
A: This names only the topic; it tells what the passage is about but not what it says.
B (correct): This is a full statement that names the subject and says what the passage claims about it.
C: This lists supporting details about what can be borrowed and for how long, but it leaves out the program's purpose.
D: This is too broad; the passage describes only one library's program, not libraries everywhere.
Question 3 of 28 · easy
Last spring, the Riverside farmers market moved from a gravel lot to the paved square downtown. Organizers added shaded seating, a bike rack, and a stand where shoppers can pay with a card instead of cash. Several new vendors joined, including a bakery and a cheese maker. As a result, the market drew nearly twice as many visitors as the year before.
Which sentence best states the main idea of the passage?
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Answer: C
Correct answer: Moving and improving the market brought in far more visitors. The passage lists changes first and ends with "As a result," which signals the summary. The main idea links the changes to their outcome: the market roughly doubled its visitors.
A: This is one detail from the middle of the passage, not what the details add up to.
B: This turns one market's experience into a rule for all markets, which the passage never states.
C (correct): The last sentence, signaled by "As a result," ties the move and the improvements to the larger crowds.
D: The passage never says what shoppers prefer; it only mentions a card payment stand.
Question 4 of 28 · easy
The backup generator behind the clinic was installed more than twenty years ago. During last month's storm, it took three tries to start, and it shut off twice while running. A repair technician noted rust on the fuel line and said replacement parts for that model are no longer made. Staff now keep flashlights and battery lanterns at every nurses' station, just in case the lights go out.
Which statement is best supported as the main idea of the passage?
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Answer: B
Correct answer: The clinic's old generator has become unreliable in an emergency. No single sentence states the point, so ask what all the details share. An aging machine that struggled to start, shut off, has rust, and lacks parts, plus staff keeping flashlights ready, all point to one conclusion stated without exaggeration: the generator is unreliable.
A: This may be true in general, but the passage does not discuss outages beyond one storm.
B (correct): No sentence says this outright, but the age, the failures, the rust, and the flashlights all point to it.
C: The passage never mentions plans to buy anything; this adds an unstated fact.
D: This overstates the details; they show the generator is unreliable, not that failure is certain.
Question 5 of 28 · easy
A small regional trucking company with about forty trucks cut its fuel spending last year. Managers first lowered the top speed on every truck to 62 miles per hour. They also trained drivers to avoid long idling during deliveries and replaced worn tires that had been dragging down mileage. Together, these steps reduced the company's fuel bill by about 12 percent.
Which statement from the passage is a supporting detail rather than the main idea?
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Answer: B
Correct answer: Drivers were trained to avoid long idling during deliveries. Supporting details are the specific facts and steps that back up the main point. The speed limit, the idling training, and the new tires are details; the idea that these changes together reduced fuel spending is the main idea.
A: The passage says nothing about fuel prices; this adds outside information.
B (correct): This is one of several steps the company took; it backs up the main point but does not cover the whole passage.
C: This is the main idea itself, since it sums up all of the steps and their result.
D: The passage never makes a general recommendation; it reports what one company did.
Question 6 of 28 · easy
In the small river town of Millbrook, neighborhood volunteers planted forty shade trees along Main Street over two summers. City workers measured sidewalk temperatures before and after the trees grew in. On hot afternoons, the shaded stretches of sidewalk were noticeably cooler than they had been, and more shoppers now walk the street during summer instead of driving between stores.
Which choice best states the main idea without going beyond what the passage covers?
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Answer: D
Correct answer: New shade trees made Millbrook's Main Street cooler and more walkable. The passage describes one project and its effects: cooler sidewalks and more people walking. The correct choice keeps that scope instead of stretching it to all cities or shrinking it to one detail.
A: This draws a general claim about all small towns that the passage does not support.
B: This is too narrow; it gives only the first detail and leaves out the results.
C: This is too broad; the passage describes one street in one town and never ranks methods.
D (correct): This stays the same size as the passage: one town, one street, and the effects the passage reports.
Question 7 of 28 · easy
Many new runners believe they must train every day to improve. Coaches often recommend the opposite approach. Rest days give muscles time to repair the tiny tears that hard workouts cause, and that repair is what makes muscles stronger. Runners who skip rest are more likely to develop sore joints and stress injuries, which can keep them off the road for weeks.
Which statement best expresses the main idea of the passage?
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Answer: B
Correct answer: Rest days help runners get stronger and avoid injury. The passage sets up a common belief and then argues against it. Every later sentence explains why rest helps, so the main idea is that rest days make runners stronger and reduce injuries.
A: This reverses the point; the passage presents daily training as a mistaken belief.
B (correct): This keeps the passage's direction: rest supports repair, strength, and injury prevention.
C: This borrows the topic of rest days but flips the claim from helpful to harmful.
D: This is a supporting detail explaining why rest matters, not the passage's point.
Question 8 of 28 · medium
The Gray Point lighthouse was staffed by keepers for nearly ninety years. Each night, a keeper climbed the tower to light the lamp, wind the clockwork that turned the lens, and log passing ships. In 1962 an automatic electric light replaced the keepers, and the keeper's house was left empty. Today the house serves as a small museum that displays the old logbooks and tools.
Which statement is best supported by the passage as its main idea?
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Answer: C
Correct answer: Gray Point's lighthouse was automated, and its keeper's house became a museum. The passage traces one lighthouse from keeper operation, through automation in 1962, to its present use as a museum. Choices about the whole country or about GPS may sound true in real life but are not supported by this passage.
A: This is accurate but covers only the description of the keepers' duties.
B: This may be true historically, but the passage discusses only one lighthouse.
C (correct): This covers the keepers' work, the switch to automation, and what became of the house.
D: The passage never mentions GPS; this relies on outside knowledge.
Question 9 of 28 · medium
Hartwell Bakery used to bake the same number of loaves every day, no matter the weather or the day of the week. Last year the owner began tracking sales and adjusting each morning's batch to match. On slow rainy days, the ovens now turn out fewer loaves. Fewer unsold loaves end up in the dumpster at closing, and the bakery donates the small amount left over to a nearby shelter instead of tossing it.
What idea ties the sentences of this passage together?
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Answer: D
Correct answer: Matching baking to expected sales helped the bakery cut wasted bread. The words change from "fewer loaves" to "fewer unsold loaves end up in the dumpster" to "instead of tossing it," but the recurring concept is reducing waste. The main idea connects tracking sales to that reduction.
A: This is one example of how batches change, not the idea that links every sentence.
B: The passage never says sales rose; it says the bakery adjusts its baking to match sales.
C: This detail comes at the end and shows one result, but the passage is about reducing waste overall.
D (correct): The passage returns again and again to the idea of less waste, using different words each time.
Question 10 of 28 · medium
Researchers surveyed workers at twelve offices about the number of sick days they took in a year. Offices with many indoor plants reported fewer sick days, on average, than offices with few or none. The researchers noted that the plant-filled offices also tended to be newer buildings with better ventilation, so they could not say whether the plants themselves made the difference. They called for a controlled study.
Which statement best expresses the main idea of the passage?
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Answer: C
Correct answer: Plant-filled offices had fewer sick days, but plants may not be the cause. The survey found that plants and fewer sick days went together, but the researchers pointed out another possible explanation and asked for further study. The main idea must keep that same careful level: a link, not a proven cause.
A: This is a supporting detail, and it covers only one sentence of the passage.
B: The passage names ventilation only as a possible factor; it does not say ventilation is the cause.
C (correct): This reports the pattern and keeps the researchers' caution about cause.
D: This turns a pattern into a cause, which the researchers explicitly refused to claim.
Question 11 of 28 · medium
A new rubber coating for flat roofs can extend a roof's life in many climates, according to the company that makes it. In tests, roofs treated with the coating cracked less often during cycles of heat and cold. The company notes, however, that results depend on how well the roof surface is cleaned before the coating goes on, and that roofs with existing leaks usually need repairs first.
Which statement best matches the main idea and its level of certainty?
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Answer: A
Correct answer: The coating can help many flat roofs last longer when it is applied properly. The passage uses limiting words such as "can," "many," and "depend on." The best main idea keeps the same strength: the coating can extend roof life when the surface is properly prepared.
A (correct): This keeps the passage's limits: "can," "many climates," and the need for good preparation.
B: This upgrades "cracked less often" to "prevents all cracking," claiming far more than the passage.
C: This contradicts the passage, which says it can help in many climates.
D: This reverses a detail; the passage says roofs with leaks usually need repairs before coating.
Question 12 of 28 · medium
Composite decking, made from wood fibers and plastic, has become popular with homeowners. It resists rot and insects and never needs staining, so yearly upkeep is minimal. On the other hand, composite boards cost noticeably more than pressure-treated wood, and in direct summer sun their surface can become uncomfortably hot for bare feet. Some boards also fade slightly during their first year outdoors.
Which statement best summarizes the passage?
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Answer: C
Correct answer: Composite decking needs little upkeep but costs more and has some drawbacks. The phrase "On the other hand" signals that the passage weighs two sides. The main idea is the balance itself: composite decking saves on maintenance but brings higher cost and some comfort and appearance trade-offs.
A: This picks a winner, but the passage weighs benefits against drawbacks without recommending one.
B: This overstates one drawback; the passage says hot for bare feet, not unusable.
C (correct): This keeps both sides of the passage: the low maintenance and the cost, heat, and fading.
D: This covers only the advantages and ignores the turn signaled by "On the other hand."
Question 13 of 28 · medium
Before cold weather arrives, boat owners in northern lakes follow a routine for their outboard motors. They run fresh water through the engine to flush out sand and lake water. Next they add stabilizer to the fuel so it will not break down over the months ahead. Finally, they fog the cylinders with a light oil and store the motor upright in a dry place. Owners who skip these steps often find corroded parts or a motor that will not start in spring.
What is the main idea of the passage?
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Answer: D
Correct answer: A winter routine protects outboard motors from damage during storage. A list of steps still has an overall point, usually its purpose. Flushing, adding stabilizer, and fogging all serve to protect the motor over winter, which the final sentence confirms by describing what happens when owners skip them.
A: This is one step in the process, not the reason the steps are described.
B: This turns one step into a guarantee the passage does not make.
C: The passage never compares boat motors with car engines.
D (correct): This names the purpose that ties all the steps together and fits the warning in the last sentence.
Question 14 of 28 · medium
Workers at the Lakeview packaging plant often arrived late because the employee lot filled up by 6:45 each morning. Late arrivals meant production lines started short-handed. To fix this, the company leased an empty lot two miles away and began running a free shuttle bus every ten minutes before each shift. Within two months, late arrivals had dropped sharply and lines were starting on time.
Which statement best expresses the main idea of the passage?
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Answer: B
Correct answer: A shuttle from a leased lot reduced late starts caused by full parking. This is a problem-and-solution passage. The main idea covers both halves: the parking shortage that caused late starts and the shuttle from a leased lot that reduced them.
A: This states only the problem and leaves out how the company responded.
B (correct): This connects the problem, crowded parking and late starts, with the response and its result.
C: The passage never recommends building lots; the company leased a lot elsewhere.
D: This states only part of the solution and ignores the problem it was meant to fix.
Question 15 of 28 · medium
Two county libraries tried staying open until 9 p.m. on weeknights instead of closing at 6. At the first branch, evening visits rose by about a third during the first six months. At the second, students began using the study rooms after work and sports practice, and the branch reported its busiest school year in a decade. County officials are now considering later hours at other branches.
Which statement is best supported by the passage?
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Answer: A
Correct answer: Later hours can draw more library visitors, as two branches found. The passage gives two examples and then reports that officials are only considering expansion. The best answer generalizes only as far as the examples allow: later hours can increase library use.
A (correct): This draws a modest conclusion that matches the evidence from two branches.
B: This reverses the direction of the passage, which reports benefits from staying open later.
C: The passage says officials are considering it, not that it will happen.
D: Two examples do not prove that every library will get the same result.
Question 16 of 28 · medium
The engine room of the old cargo ship sat below the waterline, reached by a steep metal ladder. The air was thick with the smell of diesel, and the temperature often climbed past 110 degrees. Crew members wore ear protection because the engines roared so loudly that shouted words were lost. Pipes ran along the low ceiling, and anyone over six feet tall had to stoop between the machines.
What overall impression do the details in the passage create?
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Answer: A
Correct answer: The engine room was a hot, loud, and cramped place to work. A descriptive passage chooses details to create one impression. Heat, deafening noise, a steep ladder, and stooping under pipes together show that the engine room was a harsh, cramped workplace.
A (correct): Each detail, from the heat and noise to the low ceiling, builds this single impression.
B: The passage describes conditions; it does not argue for replacing anything.
C: Pay is never mentioned; this adds information the passage does not give.
D: This is one detail that supports the overall impression rather than the impression itself.
Question 17 of 28 · medium
Route 4 and Route 9 buses both cost two dollars per ride, and both stop at City Hall, the hospital, and the main library. Both use new low-floor buses with room for wheelchairs. The important difference is the schedule. Route 4 runs only on weekdays, while Route 9 runs seven days a week, including evenings. Riders who work weekend shifts have learned to depend on Route 9.
Which statement best expresses the main idea of the passage?
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Answer: C
Correct answer: The two routes are alike in most ways, but only Route 9 runs on weekends. The passage lists similarities first, then says "The important difference is the schedule." That signal shows the main idea: the routes are alike except that Route 9 also serves weekends and evenings.
A: The passage says the fares are the same and never mentions speed.
B: This is one of the similarities that set the scene, not the point of the comparison.
C (correct): This keeps the similarities as background and stresses the single difference the passage calls important.
D: This adds a recommendation the passage never makes.
Question 18 of 28 · medium
A hospital tested a new way to train nurses on its infusion pumps. Instead of a two-hour lecture, nurses practiced on real pumps in short hands-on sessions with an instructor nearby. After the change, new nurses were able to set up the pumps on their own about a week sooner, and the number of setup errors reported in their first month fell.
Which statement best expresses the main idea of the passage?
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Answer: A
Correct answer: Hands-on practice helped new nurses learn the pumps faster and with fewer errors. A purpose explains why an author wrote, such as "to describe" or "to inform." The main idea is the claim itself: hands-on practice shortened learning time and reduced setup errors.
A (correct): This is a claim about what happened, which is what a main-idea question asks for.
B: This states the author's purpose, not the main idea the passage communicates.
C: The passage is about a new training method, not new equipment.
D: This is too broad; the passage compares two methods for one task at one hospital.
Question 19 of 28 · medium
In March, inspectors found cracks in the support beams of the Fulton Street bridge, and the city closed it to trucks. In May, engineers designed a steel brace to reinforce the beams. Crews installed the braces over the summer while keeping one lane open for cars. In October, the bridge passed a new inspection and reopened to all traffic, and a ribbon was cut at the ceremony.
Which statement best expresses what the sequence of events shows?
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Answer: A
Correct answer: The city found and repaired damage that had made the bridge unsafe for trucks. A time-order passage needs to be read for what the sequence means. From discovery of cracks, to design, to installation, to a passed inspection, the events show a problem being found and solved.
A (correct): This states what the whole sequence adds up to: a problem discovered and successfully fixed.
B: This is just the last event mentioned; the final step is not automatically the main idea.
C: The passage concerns one bridge and gives no information about other bridges.
D: This is one step in the middle of the timeline, not the overall meaning.
Question 20 of 28 · medium
Many apartment fires start in the kitchen, often when a pan is left on the stove unattended. A building manager in Dayton installed automatic shutoff devices on every electric range. The devices turn off a burner if no motion is detected nearby for several minutes. In the two years since, the building has had no kitchen fires, compared with three in the two years before. The manager now recommends the devices to other landlords.
Which choice best states the main idea of the passage?
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Answer: D
Correct answer: Burner shutoff devices were followed by an end to kitchen fires in one building. Choices that repeat the passage's exact words can feel accurate, but here they capture only the opening background. The passage as a whole shows that installing shutoff devices in one building was followed by zero kitchen fires.
A: This repeats a phrase from the first sentence, which is background rather than the point.
B: This nearly copies the passage's opening sentence, but it only introduces the problem.
C: The passage says only that one manager recommends them, not that all landlords use them.
D (correct): This paraphrase covers the problem, the devices, and the result the passage reports.
Question 21 of 28 · hard
The volunteer fire department in Clay County began a monthly training night three years ago. Members practice pumping water from ponds, handling ladders in the dark, and treating burns. Last winter, a crew used those skills when a barn caught fire during an ice storm and the nearest hydrant was frozen; the crew drew water from a farm pond and kept the flames from reaching the house next door. The chief says regular practice is why new volunteers now feel ready for real calls.
Which statement best expresses the main idea of the passage?
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Answer: D
Correct answer: Regular training has prepared the county's volunteers for real emergencies. The barn fire is memorable, but it serves as evidence for a larger point. The opening describes the training, the fire shows the training in action, and the chief's final statement ties it together: regular practice has made the volunteers ready for real calls.
A: The passage mentions one frozen hydrant but never ranks dangers.
B: The passage makes no comparison with paid departments; this is unsupported.
C: This is the most vivid detail, but the passage uses it as an example of what training made possible.
D (correct): This covers the training, the barn fire that illustrates it, and the chief's conclusion.
Question 22 of 28 · hard
Farmers in a three-year field study planted a winter cover crop of rye on half of each field and left the other half bare. In the following spring, the rye-covered halves lost less topsoil to runoff in most of the study fields. Researchers cautioned that results varied with slope and rainfall, and that the rye may reduce erosion most on gently sloping land. They plan to repeat the study in a drier region.
Which statement best expresses the main idea of the passage at the same level of certainty the author uses?
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Answer: B
Correct answer: A rye cover crop may reduce soil erosion, though results varied by conditions. The study found less soil loss "in most" fields, and the researchers stressed that results "varied" and that rye "may" help most on gentle slopes. Only a choice that keeps this careful, qualified wording matches the passage.
A: This reverses the finding; the passage says the effect may be smallest, not negative, on steeper land.
B (correct): This keeps the passage's hedged claim: less soil loss in most fields, with results depending on slope and rainfall.
C: This claims a guaranteed, universal result that the cautious researchers never stated.
D: This upgrades "lost less topsoil" into "eliminates," turning a possibility into a certainty.
Question 23 of 28 · hard
Households can trim their heating and cooling bills without major renovations. Sealing gaps around windows and doors with weatherstripping keeps conditioned air inside. A programmable thermostat can lower the temperature automatically while people sleep or are away at work. Closing curtains on summer afternoons blocks heat from the sun. Each step costs little, and together they can make a noticeable difference in monthly energy costs.
Which statement best expresses the main idea of the passage?
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Answer: D
Correct answer: Several low-cost steps can reduce a household's heating and cooling bills. The passage opens with a general claim and then gives three examples: weatherstripping, a programmable thermostat, and curtains. The final sentence confirms that the examples illustrate one point, that several inexpensive steps together can cut energy bills.
A: The passage never ranks the steps; it presents them as equally useful parts of a set.
B: This reverses the opening sentence, which says savings are possible without renovations.
C: This treats one example as the whole subject; the thermostat is just one of several steps.
D (correct): This covers all the examples and the closing statement that they work together.
Question 24 of 28 · hard
Starting next month, the state will convert the left lane of Highway 30 into an express toll lane during rush hours. Drivers who pay the toll, which will range from one to six dollars depending on traffic, can use the lane. Buses and vehicles carrying three or more people may use it for free. The other two lanes will remain free for all drivers. Officials expect to adjust prices every few minutes based on congestion.
Which statement best expresses the main idea of the passage?
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Answer: C
Correct answer: Highway 30 will get a rush-hour toll lane with prices that follow traffic. The passage is a neutral description. The correct summary states what the policy is, a rush-hour toll lane with variable prices and free use for buses and carpools, without adding an opinion or a prediction the author never made.
A: This adds a judgment; the passage describes the policy without calling it fair or unfair.
B: This is accurate but covers only one detail of the policy.
C (correct): This accurately summarizes the new policy as the passage neutrally describes it.
D: The passage makes no prediction about ending congestion; this adds an unstated claim.
Question 25 of 28 · hard
Engineers tested a zinc-rich primer on steel cable samples meant for suspension bridges. In a laboratory chamber, the samples were sprayed with salt mist for 2,000 hours to imitate years of coastal weather. Coated samples showed far less rust than uncoated ones, and the coating stayed bonded even after repeated bending. The team noted that laboratory conditions cannot fully match real weather, and they have begun a five-year field test on a working bridge to confirm the results.
Which statement best expresses the main idea of the passage?
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Answer: C
Correct answer: A primer slowed rust on cable samples in lab tests, pending field results. Note what was studied (a primer on cable samples), what was found (much less rust in the lab), and how sure the author sounds (lab results need field confirmation). The main idea links all three at that same level of certainty.
A: This reverses the team's caution that lab conditions cannot fully match real weather.
B: This claims real-world proof, but the passage says field testing has only begun.
C (correct): This connects the subject to the finding and keeps the author's caution about lab results.
D: This is a true supporting detail but leaves out the main finding about rust and the planned field test.
Question 26 of 28 · hard
A software company let one of its customer support teams try a four-day workweek for six months, with longer hours on each working day. During the trial, the team answered about the same number of customer requests as before, and customer satisfaction scores held steady. Team members reported less fatigue in surveys. The company has not yet decided whether to offer the schedule to other departments.
Which statement is best supported by the passage alone, without added assumptions?
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Answer: A
Correct answer: One team kept its output steady on a four-day week and reported less fatigue. The least-assumption rule favors the choice defensible from the passage alone. The trial showed steady output and satisfaction plus less reported fatigue for one team; any claim about other departments, rising productivity, or customer preferences requires facts the passage never gives.
A (correct): Every part of this statement comes directly from the passage, so it needs no added facts.
B: Satisfaction scores held steady; nothing says customers noticed or preferred the schedule.
C: The passage says output stayed about the same, so it does not support a gain.
D: This assumes results from one support team would carry over to all departments, which the passage leaves undecided.
Question 27 of 28 · hard
For decades, the town of Westbrook removed snow from its streets by plowing and spreading large amounts of rock salt. The method kept roads clear, and residents were used to it. However, salt runoff was raising salt levels in the town's reservoir and corroding the steel in two local bridges. Last winter, crews began spraying a salt-water brine on roads before storms, which kept ice from bonding and used much less salt overall.
Which statement best expresses the main idea of the passage?
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Answer: A
Correct answer: Westbrook switched to brine to cut salt use after salt caused damage. Test close choices against the most central sentence and the least related one. A choice about decades of clear roads fits the opening but leaves the brine sentence stranded; a choice about runoff misses the solution. Only the choice linking the salt damage to the switch to brine covers every sentence.
A (correct): This covers both the problem signaled by "However" and the town's response.
B: This is one part of the problem and leaves out the town's new method.
C: The passage does not compare performance in every storm; it says brine used much less salt.
D: This fits only the opening sentences and ignores the turn and the change that follows.
Question 28 of 28 · hard
Last fall, a beekeeper in Harlan noticed that two of her eight hives had far fewer bees than usual. In early spring, a third hive showed the same thinning, and the bees in it were slow to leave in the mornings. Honey stores in all three hives were lower than in the healthy ones. She has sent samples to the state agriculture lab and moved the weak hives away from the others while she waits for results.
Which statement best expresses the implied main idea of the passage?
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Answer: B
Correct answer: Something is weakening several hives, and the beekeeper is seeking the cause. No sentence states the main idea, so ask what conclusion the details share. Declining numbers, slow bees, low honey stores, lab samples, and separated hives all point to a problem of unknown cause being investigated. The best choice says that much and no more.
A: The passage never mentions pesticides; this adds an outside explanation.
B (correct): This states what all the details point to without claiming a cause or an outcome the passage does not give.
C: This is one supporting action, not the point the details add up to.
D: This exaggerates the details; only three hives are affected and no cause has been identified.
Road crews that work near moving traffic are safer when drivers can see them from far away. For that reason, every worker on a highway crew must wear a bright orange or yellow vest with reflective stripes. In daylight, the bright color stands out against gray pavement and green roadsides. At night, the stripes bounce headlight beams back toward drivers, so a worker appears as a glowing shape hundreds of feet ahead. The extra seconds of warning give drivers time to slow down and move over.
Which statement best expresses the main idea of the passage?
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Answer: D
Correct answer: High-visibility vests protect road workers by making them easier for drivers to spot. The first sentence states the point: crews are safer when drivers can see them from far away. The rest explains how bright vests and reflective stripes do this by day and by night, so the main idea is that the vests protect workers by making them visible.
A: This is an accurate detail about night conditions, but it leaves out the daytime color and the overall safety point.
B: The passage mentions drivers slowing down only as a result of the warning; it does not argue a rule for drivers, so this shifts the focus.
C: The passage never compares highway work with other jobs; this claim is far broader than anything stated.
D (correct): This matches the opening claim, and every later sentence explains how the vests make workers visible and why that helps.
Practice 2 of 38 · medium
Last year a downtown hotel stopped replacing towels and sheets every day for guests staying more than one night. Instead, guests could hang a card on the door when they wanted fresh linens. Within six months, the hotel was running about 30 percent fewer laundry loads each week. Its water bill shrank, the dryers used less natural gas, and the housekeeping staff spent less time hauling carts of linens. Overall, letting guests choose when to get fresh linens cut the hotel's operating costs.
What is the main idea of the passage?
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Answer: C
Correct answer: Letting guests request fresh linens only when needed lowered the hotel's costs. The passage lists results (fewer loads, a smaller water bill, less gas, less staff time) and then sums them up with "Overall": the new linen policy cut costs. The repeated concept is savings, so the choice that links the policy to lower costs covers every sentence.
A: This is a true number from the passage, but it is only one of several results and does not state what they add up to.
B: The passage says nothing about what guests prefer; this relies on an assumption the author never makes.
C (correct): The last sentence pulls the facts together, and every detail, from fewer loads to lower water and gas use, is a form of savings.
D: This stretches one hotel's experience into a claim about all hotels, which is too broad.
Practice 3 of 38 · medium
The used sedan on the lot looks clean and shiny from the outside. When the carpet in the trunk is lifted, though, a thin layer of dried mud lies underneath. The bolts that hold the front seats to the floor are coated with orange rust, even though the car is only four years old. A musty smell fills the cabin when the windows are closed, and moisture has fogged the inside of both headlight lenses.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: Hidden clues suggest the car may have water damage despite its clean look. This passage has an implied main idea. Ask what conclusion all the details share: mud under the carpet, rust on new bolts, a musty smell and moisture in the lights all suggest water got inside. The best choice states that conclusion without going further than the clues allow.
A: These are two real details, but the choice skips the mud and the fogged lenses and never says what the clues add up to.
B: The details point toward water damage, but nothing proves a major flood or predicts a breakdown, so this exaggerates.
C: The passage describes one car, not dealers in general, and never says anyone hid anything.
D (correct): No sentence states this directly, but the mud, rust, musty smell and fogged lenses all point to water damage, and the choice does not claim more than the clues show.
Practice 4 of 38 · easy
Two days before a holiday weekend, the baggage room under the airport terminal never slows down. Conveyor belts rattle nonstop as suitcases tumble out of the chutes faster than handlers can grab them. Carts piled with bags weave between one another, and drivers shout over the beeping of tow tractors backing up. Strollers, golf bags, and boxes tied with string crowd every open corner of the floor.
Which choice best states the main idea of the passage?
Show the answer
Answer: C
Correct answer: Before a holiday weekend, the baggage room is crowded, noisy, and hectic. A descriptive passage still has a focus. The rattling belts, weaving carts, shouting drivers and cluttered floor all create one impression: the room is extremely busy before the holiday, so the main idea names that impression.
A: The passage only describes the scene; it never recommends hiring, so this adds an opinion.
B: This repeats one detail and misses the overall picture the details create.
C (correct): Every detail, from the rattling belts to the crowded corners, builds one impression of a busy, packed space.
D: The passage does not judge travelers or say anything about how much they pack.
Practice 5 of 38 · easy
When some radiators in a hot-water heating system stay cool at the top, trapped air is often the reason. To release it, first turn on the heat and let the system warm up. Next, hold a rag under the small valve at the top corner of a cool radiator and turn the valve slowly with a radiator key. A hiss of air will escape, followed by a trickle of water. Close the valve as soon as water appears. Removing the trapped air lets hot water fill each radiator so it can heat the room evenly.
What is the main idea of the passage?
Show the answer
Answer: B
Correct answer: Bleeding trapped air from a radiator helps it fill with hot water and heat evenly. For a process passage, ask why the steps are being described. The opening names the problem (cool radiators from trapped air), the steps release the air, and the last sentence gives the result: radiators heat evenly. The main idea is the purpose of the whole process, not any single step.
A: This is one step of the process, not the reason the whole process is described.
B (correct): This states the purpose that unites the steps, which the final sentence makes clear, and it covers the problem described at the start.
C: The passage never compares heating systems; this brings in outside ideas.
D: The passage treats the trickle of water as a normal signal to close the valve, so this reverses its meaning.
Practice 6 of 38 · medium
Every fall, the streets of the Harbor Hill neighborhood flooded during heavy rains. Fallen leaves piled up on the storm drain grates, and water had nowhere to go, so it pooled across intersections and seeped into basements. The city could not afford to send crews to every drain before each storm. In response, it asked residents to adopt the drain nearest their homes and rake it clear whenever rain was forecast. More than 200 drains were adopted in the first season, and flooding complaints from the neighborhood dropped by more than half.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: C
Correct answer: Recruiting residents to clear leaf-clogged drains cut flooding in the neighborhood. This is a problem-and-solution passage: leaves blocked drains and caused flooding, and the city answered by having residents adopt and clear drains, after which complaints fell by more than half. The main idea must connect the problem to the fix and its result.
A: This states only the problem and leaves out the volunteer program and its results.
B: This is a true number, but it is a supporting detail rather than the point it supports.
C (correct): This links the problem (drains blocked by leaves) to the solution (resident volunteers) and its result (fewer flooding complaints), covering both halves.
D: The passage says the city could not afford more crews; it never recommends hiring, so this adds a judgment.
Practice 7 of 38 · medium
Two stepladders sit side by side in a hardware store aisle. Both are eight feet tall, both are rated to hold 300 pounds, and both fold flat for storage. The aluminum ladder is a few pounds lighter and slightly cheaper. The fiberglass ladder, however, does not conduct electricity, while aluminum does. For that reason, electricians and anyone working near power lines or live wiring are advised to choose fiberglass, since an aluminum ladder could carry a dangerous shock.
What is the main idea of the passage?
Show the answer
Answer: B
Correct answer: The ladders are alike in many ways, but only fiberglass is safe near electricity. In a comparison that stresses one difference, the similarities only set the scene. After "however," the passage focuses on the fact that fiberglass does not conduct electricity, and it ends by explaining why that matters, so the main idea centers on that difference.
A: This is a real minor difference, but the passage uses "however" to shift attention to the electrical difference, which is the point.
B (correct): The similarities set the scene, and the passage stresses one key difference: fiberglass does not conduct electricity, which matters for electrical work.
C: This reverses the passage, which warns that an aluminum ladder could carry a shock near live wiring.
D: These are the similarities that set up the comparison, not the difference the passage emphasizes.
Practice 8 of 38 · hard
Researchers followed about 2,000 adults for five years and found that dog owners had lower average blood pressure than people without pets. Dog owners also reported walking more each week. The researchers pointed out, however, that the dog owners in the study were younger on average and had been more physically active before they got their dogs. Because of these differences, the team said the study could not show whether owning a dog actually lowers blood pressure. They called for a study that compares similar groups of people over time.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: Dog owners had lower blood pressure, but the study could not show that dogs caused it. Note what was studied, what was found, and how sure the authors are. The finding is that dog owners had lower blood pressure, but the researchers stress that other differences between the groups mean the cause is unknown. The main idea must keep that same caution, so any choice saying dogs lower blood pressure claims too much.
A: The passage reports a pattern but the researchers say it does not prove cause, so this turns a link into a cause.
B: This comes from a supporting detail about the study group; it is not the point the whole passage makes, and the passage does not state it as a general rule.
C: The passage gives no health advice, and the researchers specifically avoid claiming dogs improve blood pressure.
D (correct): This keeps both the finding and the researchers' caution, matching the passage's careful level of certainty.
Practice 9 of 38 · medium
Rumble strips are grooves cut into the shoulder of a highway. When a drifting car's tires roll over them, the car shakes and makes a loud humming noise that can wake a drowsy driver. Studies in several states have found that adding shoulder rumble strips to rural highways can reduce crashes in which a car runs off the road. The benefit appears smaller on roads with very narrow shoulders, where a driver has little room to steer back after hearing the warning. Some nearby residents have also complained about the noise.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: Rumble strips can cut run-off-road crashes, though the benefit depends on road conditions. Watch the qualifying words. The passage says rumble strips "can reduce" crashes and that the benefit is smaller on narrow-shouldered roads. The best main idea keeps that same strength and limit; choices with "all" or a reversed effect go too far.
A (correct): This keeps the passage's careful "can reduce" wording and its limit about narrow shoulders.
B: The passage says rumble strips can reduce such crashes and help less on narrow shoulders; "prevent all" upgrades a possibility into a guarantee.
C: This reverses the passage, which describes the noise as a helpful warning.
D: This is a minor detail from the last sentence, not the point of the whole passage.
Practice 10 of 38 · medium
Tankless water heaters warm water only when a faucet is turned on, so they do not waste energy keeping a large tank hot all day. They also take up far less space, since a unit about the size of a suitcase hangs on the wall. On the other hand, a tankless heater usually costs much more to buy and install than a standard tank. Many homes also need a larger gas line or new electrical wiring before one can be installed, and that work adds to the bill.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: Tankless water heaters save energy and space but cost more to buy and install. When a passage weighs two sides, the main idea is the balance itself. The first half lists energy and space savings, and after "On the other hand" the second half lists higher purchase and installation costs. The best summary keeps both.
A (correct): This keeps both sides of the passage: the advantages before "On the other hand" and the costs after it.
B: The passage weighs benefits against costs and never names a winner, so this picks a side and overstates.
C: This reverses a detail; the passage says a standard tank, not a tankless unit, keeps water hot all day.
D: This is one detail about installation costs and leaves out the advantages entirely.
Practice 11 of 38 · medium
Missed medical appointments waste doctors' time and delay care for other patients. At two Army posts, clinics began letting service members book and cancel appointments through a website instead of only by phone. At the first post, missed appointments fell by about a fifth over the next year. At the second, the clinic reported a similar drop, and the open slots from early cancellations were often filled by patients who needed care quickly. Officials at both clinics said online booking seemed to make it easier for busy soldiers to manage their schedules.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: Online scheduling at two clinics was followed by fewer missed appointments. The passage gives two examples of the same change followed by the same kind of result. The main idea should generalize only as far as those examples allow: online scheduling was followed by fewer missed appointments at these clinics, not a guaranteed fix everywhere.
A: Two examples support a modest conclusion; they do not prove every clinic will see the same result, and "end" overstates a drop of about a fifth.
B (correct): This stays the same size as the passage: two clinics, one change, and the reported result, without promising the same everywhere.
C: The passage never says phone booking causes missed appointments; this invents a cause.
D: This is a detail from the second clinic, not the point that ties the whole passage together.
Practice 12 of 38 · medium
Last spring, every security guard at the Eastfield shopping mall completed a one-day course in CPR and the use of an automated external defibrillator, or AED. Guards practiced chest compressions on training dummies and learned to follow the voice prompts an AED gives. The mall also mounted AEDs near both food courts and the main entrance. In August, a guard used those skills to help a shopper who collapsed near a shoe store, keeping him breathing until paramedics arrived. Mall managers now plan to repeat the training every year so new guards are prepared as well.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: The mall trained and equipped its guards to respond to medical emergencies. A vivid event can steal attention, so ask whether the whole passage is about it or uses it as an example. The passage is built around the mall's training program and equipment; the rescue illustrates the program working, so the main idea is that guards were prepared to handle medical emergencies.
A (correct): This covers the training, the new AEDs, the rescue that shows the training at work, and the plan to repeat it.
B: This is the most dramatic detail, but the passage uses the rescue as one example of why the training matters.
C: This is an accurate detail about equipment, but it covers only one sentence of the passage.
D: The passage never makes this claim; it is a broad, unsupported generalization drawn from one incident.
Practice 13 of 38 · easy
Families who live in hurricane areas are urged to pack a go-bag before storm season begins. A go-bag holds the basics a household would need for about three days away from home: water, snacks, medicine, copies of important papers, a flashlight, and phone chargers. When an evacuation order comes, there may be only an hour or two to leave. A family with a bag already packed can head out quickly instead of searching the house for supplies while traffic builds on the roads.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: C
Correct answer: Packing a go-bag ahead of time helps families evacuate quickly before a hurricane. First name the topic (go-bags for hurricanes), then state what the passage says about it: packing one ahead of time lets a family evacuate quickly. A choice that only names the topic is not a main idea, and a single supply item is only a detail.
A: This names the topic but says nothing about it; it answers "about what?" but not "so what?"
B: These are items from the list of supplies, details rather than the main point.
C (correct): This is a full statement with a subject and a claim, and every sentence supports it.
D: The passage advises preparing to evacuate, not moving permanently, so this adds an idea it never states.
Practice 14 of 38 · hard
When the Blue Ridge Canal opened in 1838, mule-drawn boats carried coal and grain along its forty miles of water. Within twenty years, a railroad line was built beside it, and trains moved freight faster and in every season. By 1890 the canal carried almost no cargo, and in 1924 a flood broke its walls and ended boat traffic for good. For decades the channel sat overgrown. In the 1970s, the state turned the old towpath into a gravel trail, and today more than half a million cyclists, joggers, and walkers use it each year.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: The canal changed from a busy freight route to a popular place for recreation. In a passage told in time order, ask what the sequence shows overall. The canal began as a freight route, lost its cargo to the railroad, fell into disuse, and became a popular trail. A purpose statement and the final event are both traps; the main idea is the overall change.
A: This states the author's purpose, not the main idea; it says why the passage was written but not what it says about the canal.
B: This is the final event in the time order, but the last step of a sequence is not automatically its main point.
C: The passage discusses one canal and one railroad line; a nationwide claim is too broad.
D (correct): This states what the whole sequence shows: the canal's role shifted over time from carrying cargo to serving trail users.
Practice 15 of 38 · hard
Barnacles and other sea life that grow on a ship's hull add drag and force the engines to burn more fuel. Engineers tested a slick silicone hull coating designed to keep these organisms from gripping the surface. On cargo ships that sailed steadily between ports, the coating stayed largely clean, because water rushing past the hull washed loose most of the young growth before it could attach firmly. On ships that sat at anchor for weeks at a time, however, barnacles built up on the coated hulls nearly as heavily as on standard painted hulls.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: The silicone coating limited hull growth mainly on ships that moved often. Use the two-sentence audit: the correct main idea must cover both the result for moving ships and the result for anchored ships. The coating helped when water flowed past the hull but not when ships sat still, so the best answer limits the benefit to ships that move often.
A: This fits the sentences about moving ships but leaves the sentence about anchored ships stranded, so it claims too much.
B (correct): This covers both halves of the finding: the coating worked on ships in steady motion but did little for ships that sat at anchor.
C: This reverses the passage's finding for cargo ships that sailed steadily, where the coating stayed largely clean.
D: This is background from the first sentence explaining why the test mattered, not the result of the test.
Practice 16 of 38 · hard
Before new forklift drivers at a parts warehouse touch a real machine, they now spend two days in a driving simulator. The simulator lets trainees practice backing up, turning in narrow aisles, and stacking pallets without any risk of damage. In the first year of the program, new drivers damaged fewer storage racks during their first month on the job. Trainers point out, though, that the simulator cannot copy the feel of a heavy load shifting on the forks. For that reason, every trainee must still complete twenty hours of supervised driving on a real forklift before working alone.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: Simulator practice helps new drivers but cannot replace supervised time on a real forklift. The passage praises the simulator (fewer damaged racks) and then turns with "though" to its limit, which is why supervised driving is still required. The choice that needs no outside facts and covers both halves is the main idea; the others reverse the point, add outside knowledge, or cover only one detail.
A (correct): This covers both the benefit (fewer damaged racks) and the limit (the simulator cannot copy a shifting load, so supervised hours remain).
B: This reverses the passage, which says every trainee must still complete twenty hours of supervised driving.
C: This may be true in real life, but the passage never mentions pilots or truck drivers, so it relies on outside knowledge.
D: This is an accurate result, but it ignores the trainers' warning and the supervised-driving requirement in the second half.
Practice 17 of 38 · hard
A city health department compared neighborhoods that have community gardens with neighborhoods that do not. Over three years, blocks near the gardens reported fewer cases of vandalism and graffiti. Some residents credit the gardens, saying that neighbors who work side by side get to know one another and keep an eye on the street. However, the report also noted that most of the garden neighborhoods already had active block associations before any garden was planted. Because of this, the department said it could not tell whether the gardens themselves reduced vandalism or whether the same organized neighbors would have kept vandalism low anyway.
Which statement best expresses the main idea of the passage at the level of certainty the author uses?
Show the answer
Answer: B
The passage reports a pattern (fewer vandalism cases near gardens) and then explains why the cause cannot be pinned down. A correct main idea must keep that same careful strength, so it states the link without claiming that gardens, or block associations, caused the drop.
A: This upgrades a link into a proven cause, repeating the residents' opinion while ignoring the department's stated doubt.
B (correct): This keeps both halves of the passage: the pattern that was found and the department's warning that the cause is unclear.
C: This swaps one unproven cause for another; the department said it could not tell which factor mattered.
D: This is an accurate supporting detail, but it explains only the caution and leaves out the finding itself.
Practice 18 of 38 · easy
Labeling the circuit breakers in a home's electrical panel can save time and trouble later. When the breakers are not marked, a homeowner who needs to shut off power to one room may have to flip switch after switch, guessing which one controls it. During a repair or an emergency, that guessing wastes valuable minutes. With each breaker clearly labeled, the right circuit can be turned off in seconds, and anyone in the household can do it safely.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: Clearly labeling breakers lets people shut off the right circuit quickly and safely. The first sentence states the main claim, and the remaining sentences support it by contrasting guessing with quick, safe shutoffs. The correct choice restates that opening claim in different words and covers the whole paragraph.
A (correct): The opening sentence states this point, and every later sentence explains the trouble without labels or the benefit with them.
B: This describes only the problem half of the passage and leaves out the benefit of labeling that the passage is built to show.
C: The passage never discusses who should make repairs; this relies on outside knowledge rather than the paragraph.
D: Emergencies are mentioned only as one situation where labels help; the passage makes no claim about how often they happen.
Practice 19 of 38 · easy
Mechanics in an Army motor pool used to lose time hunting for wrenches and gauges buried in crowded drawers. The shop sergeant had outlines of each tool painted on wall boards so an empty spot shows at a glance what is missing. Drawers were labeled by tool size, and a sign-out sheet now records who has each specialty tool. As a result, mechanics spend far less time searching, and tools rarely go missing at the end of a shift.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: C
Correct answer: Organizing the tool room saved the mechanics time and reduced lost tools. The passage lists three changes (painted outlines, labeled drawers, a sign-out sheet) and then ends with a summary signaled by "As a result." That last sentence gives the main idea: the new organization cut search time and lost tools.
A: The passage never reports the mechanics' preferences; this adds an opinion the paragraph does not give.
B: This is one of the three changes, so it is a supporting detail rather than the point that ties them together.
C (correct): The closing sentence, signaled by "As a result," pulls the three changes together into this point.
D: This is too broad and unsupported; the passage covers one motor pool and makes no comparison with other shops.
Practice 20 of 38 · medium
At 6 a.m. the thermometer inside the restaurant's walk-in cooler read 48 degrees. A puddle of water had spread across the floor beneath the fan unit, and the fan made a grinding sound each time it started. The rubber seal along the bottom of the door was torn, letting warm kitchen air seep in. The morning cook moved the milk and raw chicken into a reach-in refrigerator and called the manager.
Which statement best expresses the implied main idea of the passage?
Show the answer
Answer: B
Correct answer: The walk-in cooler is not working properly and cannot safely hold food. No sentence states the point, so ask what all the details share: a warm reading, a leak, a grinding fan, a torn seal, and food being moved elsewhere. Together they show the cooler is failing and cannot be trusted with food, which is the implied main idea stated without exaggeration.
A: This adds a judgment about the cook that the passage never makes; the details describe the cooler, not anyone's mistake.
B (correct): No sentence says this directly, but the high temperature, leak, noisy fan, torn seal, and moved food all point to it.
C: The passage lists several problems and never says which one caused the warm reading, so this claims more than it shows.
D: This rule comes from outside knowledge; the passage never states a temperature limit.
Practice 21 of 38 · hard
Cooling vests hold frozen gel packs against a worker's chest and back. In tests with roofers and warehouse crews, the vests lowered skin temperature and helped many workers feel less strained during moderate work on hot days. Researchers found that the vests may delay the onset of heat exhaustion, but the effect fades once the packs thaw, usually in about two hours. The vests also helped less when the air was very humid. The researchers advised that the vests be used along with shade, water, and rest breaks rather than in place of them.
Which statement best expresses the main idea of the passage at the level of certainty the author uses?
Show the answer
Answer: A
Note what was studied (cooling vests), what was found (they helped and may delay heat exhaustion), and how sure the author sounds (qualified, with clear limits). The best main idea keeps all three: a real but limited benefit, used alongside shade, water, and breaks.
A (correct): This matches the passage's careful verbs (helped many, may delay) and keeps the limits on time, humidity, and use with other precautions.
B: The passage says the vests may delay heat exhaustion; this turns a possibility into a guarantee.
C: The passage says the vests helped less in humidity, not that they failed; this reverses the overall positive but limited finding.
D: This accurate fact is one limit among several and leaves out what the vests do and how they should be used.
Practice 22 of 38 · medium
Last spring, the Bayside Marina began training every dock attendant to respond to fuel spills. Attendants learned where the floating absorbent booms are stored and practiced stretching them around a boat slip in under five minutes. They also learned how to shut off the fuel pumps from a single switch and whom to call at the harbor office. When a sailboat's tank overflowed in July, two attendants had the spill boxed in before it could drift past the next dock.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: The marina prepared its dock staff to contain fuel spills quickly. Hold each choice against every sentence. Only the statement about preparing staff to contain spills covers the training, the specific skills, and the July example; the others are either bigger than the passage or only one sentence of it.
A (correct): Every sentence fits under this: the training, the skills practiced, and the July spill that shows the training working.
B: This is too broad; the passage discusses one marina's training, not pollution everywhere.
C: This is one skill from the training, a detail that leaves out the pump shutoff, the phone calls, and the July spill.
D: This is the most dramatic event, but it serves as an example of the training working rather than as the passage's point.
Practice 23 of 38 · medium
Much of the food that households throw away could be saved with a few simple habits. Planning the week's meals before shopping keeps people from buying more than they will use. Storing produce correctly, such as keeping herbs in a glass of water and apples away from bananas, helps fresh food last longer. Freezing leftovers in labeled containers turns tonight's extra soup into next week's lunch. None of these habits takes much time, yet together they can cut down on what ends up in the trash.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: Several easy habits can help households throw away less food. The passage opens and closes with the same idea, and the middle sentences give three examples: meal planning, proper storage, and freezing leftovers. The main idea is the umbrella statement about simple habits, not any single example.
A: This is one of three example habits, so it is too narrow to serve as a title for the whole passage.
B (correct): The opening and closing sentences both make this point, and each middle sentence is one supporting habit.
C: The passage makes no comparison with restaurants or stores; this depends on information the paragraph never gives.
D: Meal planning is one habit among several, and the word only overstates what the passage claims.
Practice 24 of 38 · medium
Many drivers still let their cars idle for ten minutes or more on cold mornings, believing the engine needs a long warm-up. That habit dates from older carbureted engines. Modern fuel-injected engines need only about thirty seconds of idling before they can be driven. In fact, an engine warms up faster when the car is driven gently than when it sits still. Long idling simply burns fuel and adds wear without helping the engine.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: A
Correct answer: Long idling is unnecessary for modern cars, which warm up best when driven gently. Check the direction of the claim. The passage argues against long warm-ups: modern engines need about thirty seconds and warm faster while driven gently. The correct choice keeps that direction, while one tempting distractor borrows the same words but flips the message.
A (correct): This keeps the direction of the passage: the old habit is outdated, and gentle driving is the better way to warm up.
B: This uses the passage's own topic but reverses its message; the passage says long warm-ups are unnecessary.
C: This is background detail explaining where the habit came from, not the point the passage is making.
D: The passage says idling wastes fuel and adds wear; claiming damage within minutes overstates it.
Practice 25 of 38 · medium
Many military families must decide whether to live in housing on base or rent a home in a nearby town. On-base housing usually means a short commute, utilities included in the cost, and easy access to the commissary, clinic, and child care. However, families often have little choice about the size or location of the home, and at busy installations the waiting list can stretch for months. Renting off base offers more choices but brings longer drives and separate utility bills.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: C
Correct answer: Both on-base and off-base housing offer military families benefits and drawbacks. The word However marks a turn from the advantages of base housing to its drawbacks, and the last sentence gives trade-offs for renting as well. Because the author weighs both sides without choosing, the main idea is the balance: each kind of housing has benefits and drawbacks.
A: The passage never names a winner; this picks one side and ignores the drawbacks it describes.
B: This is one drawback mentioned after the turn word However, so it covers only part of the passage.
C (correct): The passage weighs convenience against limited choice and waiting, and then gives the trade-offs of renting too, so the balance itself is the point.
D: The passage mentions separate utility bills but never compares total costs; this adds a claim it does not make.
Practice 26 of 38 · easy
Planting native shrubs and flowers can make a yard easier to care for. Because these plants are adapted to the local rainfall and soil, they usually need little extra watering once they are established. They also attract local bees and butterflies, and they tend to resist the pests of the region, so homeowners can often skip chemical sprays and spend less time on yard chores.
Which statement best expresses the main idea of the passage, rather than just naming its topic?
Show the answer
Answer: C
Correct answer: Native plants make yards easier to care for in several ways. The topic is native plants, but the main idea must say something about them. The first sentence makes the claim (they make yards easier to care for), and the details about watering, pollinators, and pests support it.
A: This names the topic only; it answers "about what?" but does not say what the passage claims about native plants.
B: This is one supporting detail and leaves out the watering and pest benefits.
C (correct): This is a full statement that names the subject and the claim, and each later sentence gives one way native plants reduce yard work.
D: The passage says nothing about where to buy plants; this is unsupported.
Practice 27 of 38 · medium
Before a concrete patio is poured, a crew digs out the soft topsoil and spreads several inches of gravel. The gravel is packed down with a plate compactor so it will not settle later. Next, wooden forms are staked around the edges and checked with a level, and a sheet of wire mesh is laid inside them. Each of these steps helps the finished slab stay level and resist cracking for years.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: Careful preparation before pouring helps a concrete patio last. A process passage still has an overall point, usually the purpose of the steps. Here the final sentence explains why the crew does all of them: so the slab stays level and resists cracking. The main idea is that preparation makes the patio last, not any single step.
A: This is one step in the process, a detail that leaves out the digging, compacting, and mesh.
B: The passage makes no comparison with decks; this brings in an unsupported claim.
C: The passage mentions the compactor once and never ranks tools; this inflates one detail.
D (correct): This states the purpose behind all of the steps, which the last sentence spells out.
Practice 28 of 38 · hard
For years, passengers on the Harbor Point ferry waited in a single ticket line that often stretched into the parking lot. On summer weekends, the boats regularly left fifteen or twenty minutes late while crews waited for the last ticket buyers to board. Two years ago, the operator began selling tickets through a phone app and opened a second booth for cash buyers. The following summer, more than nine in ten departures left on time. The operator now plans to add a third boat to the route next spring.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: Faster ways to buy tickets helped fix the ferry's late departures. This is a problem-and-solution passage told in time order. The main idea must connect both halves: long lines delayed the boats, and faster ticketing fixed it. The plan for a third boat is simply the last event, and naming only the problem covers half the passage.
A: This is the last event mentioned, but the final item in a sequence is not automatically the point; it is a future plan, not the change and result the passage explains.
B: This names the problem but leaves out the fix and the improvement that the rest of the passage describes.
C: This stretches one ferry's experience into a claim about all transportation, and the passage never says apps are best.
D (correct): This links the problem (long lines and delays) to the response (app sales and a second booth) and its result (on-time departures).
Practice 29 of 38 · hard
Two high schools in the same county moved their first bell from 7:20 to 8:05 a.m. During the next school year, both reported fewer students arriving late, and one school saw first-period absences drop by about a quarter. Teachers at both schools said students seemed more alert in morning classes. County officials were pleased but cautious. They noted that the two schools are small, and that larger districts with longer bus routes or many students in after-school jobs might not see the same gains.
Which statement best expresses the main idea of the passage without generalizing beyond its evidence?
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Answer: A
The passage gives two examples and then limits what they prove. A correct main idea reports the improvement and keeps the caution; choices that turn two schools into a rule for all schools, or swap attendance for grades, claim more than the examples allow.
A (correct): This states what the two examples show and keeps the officials' warning about larger districts, so it generalizes only as far as the evidence allows.
B: Two small schools cannot support a rule for every school, and the officials specifically cautioned against assuming the same gains elsewhere.
C: The passage reports attendance and alertness, not grades, and guarantees is far stronger than its evidence.
D: This is an accurate detail about one school, but it leaves out the other school and the officials' caution.
Practice 30 of 38 · easy
In the supply room at the fire station, every shelf carries a printed label. Boxes of gloves are sorted by size in a neat row, and spare batteries sit in clear bins marked with their type. Hoses are coiled the same way and hung on matching hooks. A clipboard by the door lists each item, how many should be on hand, and the date the room was last checked.
What overall impression do the details in the passage create?
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Answer: C
Correct answer: The supply room is carefully organized and well maintained. A descriptive passage chooses details to create one impression. Labeled shelves, sorted boxes, marked bins, matching hooks, and a checklist all point to the same picture: an orderly, well-kept supply room.
A: Nothing in the passage suggests crowding; the details describe careful arrangement, not a lack of space.
B: The passage mentions batteries once and never compares how often supplies are used.
C (correct): Labels, sorted rows, matching hooks, and an inventory list all build this single impression of order.
D: This is one detail; it helps create the impression but does not state it.
Practice 31 of 38 · medium
Two portable space heaters sit next to each other on a store shelf. Both are rated at 1,500 watts, both have three heat settings, and both sell for about forty dollars. Both also have handles and are light enough to carry from room to room. Only one of them, however, shuts itself off automatically if it is knocked over. For a home with pets or small children, that single feature could keep a tipped heater from starting a fire.
Which statement best expresses the main idea of the passage?
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Answer: D
Correct answer: The heaters are alike in most ways but differ in a key safety feature. The passage lists several similarities and then turns, with however, to the one difference it cares about: the automatic tip-over shutoff. When a comparison stresses one meaningful difference, that difference is the main idea, and the similarities are only background.
A: This repeats similarities that only set the scene; it leaves out the difference the passage stresses.
B: The passage never gives fire statistics; this comes from outside the paragraph.
C: The passage suggests choosing the heater with a shutoff, not avoiding heaters; this reverses its advice.
D (correct): The similarities lead up to the turn word however, and the rest of the passage explains why the tip-over shutoff matters.
Practice 32 of 38 · easy
Four soldiers who live in the same town began sharing one car for the drive to post. Splitting the cost of gas cut each person's fuel spending by about three-fourths. They also pay for only one parking permit, and the bridge toll is now divided four ways. Even after setting aside money for the driver's extra wear on tires, each rider spends far less each month than before.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: Sharing rides to post saves each of the soldiers money. The passage keeps returning to the same idea in different words: cut fuel spending, one parking permit, a divided toll, spends far less. Tracking that repeated concept points to the main idea that ride sharing saves each soldier money.
A: This is one of several examples of savings, so it is too narrow to be the main idea.
B (correct): Fuel, parking, tolls, and the monthly total all express the same repeated concept: lower costs for each rider.
C: The passage never mentions travel time; it focuses only on cost.
D: The passage mentions setting money aside for tire wear as a detail, not as its main argument.
Practice 33 of 38 · hard
Scientists who watch active volcanoes rely on several kinds of signals. Networks of seismometers record swarms of small earthquakes as magma pushes upward through rock. GPS stations and satellite images measure the ground swelling by a few centimeters as the magma chamber fills. Instruments near vents track changes in gases such as sulfur dioxide. No single signal is reliable by itself, and none can reveal the exact day an eruption will begin. Taken together, however, these measurements often give enough warning for officials to close roads and move people out of danger.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: Combining several kinds of measurements often lets scientists warn people before an eruption. Use the two-sentence audit: the choice must fit both a central sentence (the signals taken together give warning) and the cautious one (no single signal is reliable, and none gives an exact date). Only the statement about combining measurements to warn people covers both at the author's level of certainty.
A: This accurately describes one of the three signals, but it leaves out the others and the point about combining them.
B (correct): This covers the three signals, the caution that none works alone or gives an exact date, and the result of using them together.
C: The passage directly says no signal can reveal the exact day, so this reverses one of its key sentences.
D: The passage says no single signal is reliable by itself and never ranks one above the others.
Practice 34 of 38 · easy
How a rucksack is packed affects how hard it is to carry. The heaviest items, such as water and food, should sit in the middle of the pack, close to the spine. Placed there, their weight rides over the hips instead of pulling the shoulders backward. Lighter, bulky gear like a sleeping bag goes at the bottom, and items needed often, such as a map or rain jacket, go in the top or outside pockets.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: Packing a rucksack carefully makes the load easier to carry. The opening sentence states the main claim, and the following sentences show how to place heavy, bulky, and often-needed items. A purpose phrase such as "to explain" describes why an author writes, not what the passage says.
A: This states a purpose, not a main idea, and the passage never mentions training.
B: This is one detail used to illustrate where heavy items belong, not the point of the passage.
C: The passage is about arranging the load, not reducing it; this changes its subject.
D (correct): The first sentence states this claim, and the rest of the passage explains how placing each kind of item helps.
Practice 35 of 38 · hard
The town of Port Ellis has a beach that grows narrower each year as waves carry sand down the coast. This fall, the town hired a dredging company to pump sand from the seafloor about a mile offshore through a pipeline onto the beach. Bulldozers then spread the sand to widen the beach by roughly one hundred feet. Town engineers expect the waves to carry much of the new sand away again within five to seven years. The town has set aside money to repeat the project when that happens.
Which statement best expresses the main idea of the passage based only on what it says?
Show the answer
Answer: A
The passage describes a problem (waves narrow the beach), a response (pumping and spreading sand), and an expectation (the sand will wash away, so the work will be repeated). The correct statement captures all three without the outside knowledge or personal judgment found in the most tempting distractors.
A (correct): This covers the problem, the method, and the engineers' expectation that the project must be repeated, without adding opinion or outside facts.
B: This may sound familiar from real life, but the passage blames waves moving sand along one town's coast and never mentions sea levels or other beaches.
C: The passage describes the project neutrally; calling it wasteful imposes a judgment the author never makes.
D: This is an accurate detail about the method but leaves out why the work is done and that it will need repeating.
Practice 36 of 38 · medium
Riders of the Metro Valley bus system used to complain that they had no idea how long they would be standing at a stop. Last year, the transit agency put digital screens at its busiest stops and launched a phone app. The screens show arrival times to the minute. Riders now wait inside nearby shops on cold days and walk out when their bus is two minutes away. Complaints about long waits fell by more than half in the first year.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: B
Correct answer: Real-time arrival information made waiting for the bus less frustrating for riders. The passage moves from a problem (riders not knowing how long they would wait) to a change (screens and an app) and a result (complaints fell by more than half). A copied sentence can feel accurate, but the paraphrased choice is the one that covers the whole chain.
A: This copies a sentence from the passage word for word, but it is only a detail about how the screens work, not the point of the whole paragraph.
B (correct): This paraphrase connects the original complaint, the new screens and app, and the result of fewer complaints about waiting.
C: The passage never calls for more buses; this adds a recommendation the author does not make.
D: The passage never compares how many riders use each tool, so this is unsupported.
Practice 37 of 38 · medium
The Ridgeline Hiking Club asks every member to carry three small items on any trip, even a short afternoon walk: a whistle, a headlamp, and an extra warm layer. The whistle can be heard much farther than a shout, the headlamp helps if a hike runs past sunset, and the extra layer guards against a sudden drop in temperature. Two winters ago, a member who slipped and twisted her ankle used all three while waiting through a snowy night for rescuers. Club leaders now check for the items at every trailhead.
Which statement best expresses the main idea of the passage?
Show the answer
Answer: D
Correct answer: The club requires a few simple safety items because they can help hikers in trouble. A vivid event sticks in memory, but ask whether the passage is about that event or uses it as an example. Here the rescue story illustrates why the club requires a whistle, headlamp, and warm layer; the main idea is the rule and its safety purpose.
A: This is the most dramatic sentence, but it serves as an example of why the gear matters rather than as the point of the whole passage.
B: This explains the reason for one item only and leaves out the other items and the club's rule.
C: The passage says nothing about hiking alone; this adds advice the paragraph does not give.
D (correct): This ties together the rule, the reasons for each item, the rescue story, and the trailhead checks.
Practice 38 of 38 · medium
For years, the shelves beside the checkout lanes at Corner Market held candy bars and chips. Last March, the manager replaced half of those shelves with bananas, apples, and single cups of cut fruit. Over the next six months, fruit sales at the registers rose by about 20 percent compared with the same months a year earlier. The manager plans to keep the new arrangement and may try it at the store's second location.
Which statement best expresses the main idea of the passage without adding assumptions the passage does not support?
Show the answer
Answer: C
Correct answer: Placing fruit at the checkout lanes was followed by higher fruit sales. Apply the least-assumption rule: the best answer should be defensible from the passage alone. The passage reports a change (fruit moved to the checkout lanes) and a result (fruit sales rose about 20 percent), so only the statement linking those two needs no added facts.
A: The passage reports fruit sales, not what shoppers ate overall; this needs extra assumptions about diets.
B: The passage gives no profit figures for either product; this adds a fact the author never supplied.
C (correct): This states the change and the result the passage reports, and it needs no facts beyond the passage.
D: The passage never reports candy sales after the change, so this rests on an unstated assumption.
About this test
Each question includes an explanation that shows how the correct statement covers the full passage and why the alternatives are too broad, too narrow or unsupported. Treat your misses as a map. A run of overbroad picks suggests revisiting the coverage test; trouble with implied ideas points to the section on coordinated examples; choosing dramatic details means rereading the trap sections of the Main Idea lesson.
For extra repetition, 38 more practice questions for this lesson are available. Your percentage reflects practice accuracy on main-idea items only and is not an ASVAB or AFQT score.
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