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SAT Reading & Writing: Hard Inferences (Drill 1)

Drill 1 · Reading & Writing · Hard Inferences

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About This Drill

SAT Reading & Writing: Hard Inferences (Drill 1) is a Reading & Writing practice drill covering Hard Inferences. It contains 5 original questions created by Brian Stewart, a Barron's test prep author with over 20 years of tutoring experience.

These hard SAT inference questions ask you to complete short academic passages by choosing the conclusion the text best supports. The right answer stays inside the evidence; the wrong ones tend to overreach, reverse the logic, or bring in something the passage never says.

Questions & Explanations

Text
For decades, researchers attributed the nighttime glow of coastal dinoflagellate blooms simply to the number of organisms present, assuming denser blooms always glowed brighter. In one controlled experiment, samples drawn from a single bloom were divided into two tanks of equal cell density; one tank was subjected to brief mechanical turbulence each afternoon, the other left undisturbed. Tested afterward under identical darkness and viewed through the same instruments, the agitated samples consistently emitted brighter flashes. Because cell density was held constant across both tanks, the findings suggest that a bloom's brightness ______

Question 1. Which choice most logically completes the text?

  • A) is governed chiefly by the total number of cells that a given bloom happens to contain.
  • B) depends on more than sheer cell count, since disturbance alone made otherwise identical samples glow more brightly. ✓
  • C) has less to do with organism density than with how long the samples rest in darkness beforehand.
  • D) cannot be gauged reliably unless the samples are observed in a natural coastal setting rather than tanks.

Explanation: (B) Two tanks at equal cell density differed only in that one was agitated, and the agitated samples glowed brighter, so brightness must depend on something beyond how many organisms are present. The choice claims exactly that, pointing to the disturbance the design isolated. (A) restates the density-only assumption the controlled comparison overturns. (C) names time in darkness, but both tanks were tested under identical darkness, so that variable was held constant and cannot explain the gap. (D) raises the measurement setting, which the passage never questions; the tanks gave consistent readings, and the point is what drives brightness, not where it can be read.

Text
A team surveying attitudes toward a proposed transit line distributed its questionnaire exclusively through the mobile app riders use to pay fares, and reported overwhelming public support. A second team noted that the fare app is used mainly by current frequent riders, while many residents most likely to oppose the line rarely ride at present and so would seldom encounter the questionnaire at all. Given that the very people likeliest to object were the least likely to be reached, the second team argued that the first survey's lopsided result was most plausibly attributable to the first team's ______

Question 2. Which choice most logically completes the text?

  • A) reliance on a channel that reached mainly frequent riders while missing the residents likeliest to object. ✓
  • B) choice to measure opinion well before the proposed transit line had actually been designed or funded.
  • C) failure to collect responses from a large enough total number of residents across the surveyed district.
  • D) use of loaded question wording that quietly steered respondents toward endorsing the proposed transit line.

Explanation: (A) The questionnaire went out only through a fare app used mainly by frequent riders, while the residents likeliest to oppose rarely ride, so the skew traces to a channel that missed those objectors, exactly what the choice names. (B) blames timing, but nothing ties the result to when the survey ran. (C) points to sample size, yet a larger count from the same app carries the same bias. (D) attributes it to loaded wording, which the passage never mentions; the argument is entirely about who could encounter the questionnaire.

Text
Some critics argue that a satire succeeds only when its audience recognizes itself, not merely its opponents, in the behavior being mocked; a satire that lets every reader assign the folly to someone else, on this view, has failed on its own terms. A playwright's recent comedy lampooning political vanity drew enthusiastic crowds, yet exit interviews found that viewers across the political spectrum each described the targets as belonging exclusively to the rival party. Judged by this standard, the comedy's warm reception ______

Question 3. Which choice most logically completes the text?

  • A) confirms that the playwright produced exactly the self-implicating satire these particular critics single out as genuinely successful work.
  • B) may show that audiences across the spectrum recognized the mocked vanity as a fault shared by both parties.
  • C) indicates that the comedy failed to entertain the very audiences who filled the theater and applauded warmly.
  • D) need not mean the comedy worked as satire on the critics' terms, since no group saw itself in the mockery. ✓

Explanation: (D) The critics' test is that the audience recognizes itself, yet every group placed the folly on its opponents, so the warm reception need not count as satiric success. The choice draws just that bounded conclusion. (A) applies the standard backwards: enjoyment without self-recognition is what the critics call failure. (B) claims viewers saw the vanity as shared, but the interviews say each group assigned the targets exclusively to the rival party, so it contradicts the text despite its cautious phrasing. (C) says the comedy did not entertain, yet it drew enthusiastic crowds.

Text
A manuscript describing a coastal monastery's daily routine was long believed to date from the abbey's founding period, since it names local landmarks accurately. But the manuscript repeatedly refers to a bell tower as a fixed feature of the cloister, and excavation of the site has shown that the tower was not erected until at least a generation after the founding. The text also mentions a prior who, according to surviving registers, did not hold office until that same later period. Together these details indicate that the manuscript ______

Question 4. Which choice most logically completes the text?

  • A) was set down by someone who, though clearly familiar with the site, had never actually lived within the monastery at all.
  • B) actually describes some altogether different religious house, and not the coastal monastery whose daily routine the surviving text explicitly claims to record.
  • C) was composed no earlier than the later period when both the bell tower and the named prior are known to have appeared. ✓
  • D) cannot be assigned even a rough date, since the evidence now available to scholars simply points in no consistent direction.

Explanation: (C) The manuscript treats as fixed a bell tower and a prior that appeared only a generation after the founding, and a text cannot describe as established what did not yet exist, so it can be no older than that later period, exactly the bound the choice states. (A) says the author never visited, but the accurate landmarks show familiarity; the anachronisms bear on when it was written. (B) claims a different house, which the accurate local detail rules out. (D) calls the text undatable, yet the tower and the prior fix a firm earliest possible date.

Text
Ecologists measuring a wetland's capacity to store carbon sampled the upper, most recently deposited layer of sediment and, finding it rich in organic matter, projected that the wetland sequestered carbon at a high steady rate. A later team that cored deeper found that the organic richness dropped off sharply below the top few centimeters, with the lower layers showing signs of repeated disturbance. The deeper cores suggest that the first team's projection was too optimistic, most likely because the upper layer ______

Question 5. Which choice most logically completes the text?

  • A) reflected only recent surface conditions rather than the long-term pattern the deeper, disturbed layers reveal. ✓
  • B) had been contaminated by organic material washed in from neighboring sites and left near the sediment surface.
  • C) was simply easier for the first team to reach and sample than the disturbed layers lying well beneath it.
  • D) held far less carbon than the first team's measuring instruments were actually capable of detecting at depth.

Explanation: (A) The rich top layer led to a high storage projection, but deeper cores show the richness falls off sharply and the lower layers were repeatedly disturbed, so the surface reflected only recent conditions, not the wetland's longer record. That mismatch is what the choice identifies. (B) invokes contamination washed in from elsewhere, never raised in the passage. (C) notes the surface was easier to sample, which may be true but does not explain why the projection was too high. (D) says the layer held undetectable carbon, yet the first team found it rich in organic matter.