Reading Comprehension is half of the GMAT Focus Verbal Reasoning section, alongside Critical Reasoning. Each passage comes with a small set of questions, and the passages cover business, the sciences, the social sciences and the humanities. No background knowledge is needed: every answer is supported by the text.
Read for structure, not for detail. On your first pass, note the purpose of each paragraph in a few words and, above all, the author’s point of view. Is the author describing a debate, defending one side, or qualifying a popular idea? Signal words such as “yet”, “however”, “in short” and “this does not settle” tell you where the argument turns. You can return to the details when a question asks for them.
The questions fall into a few families: main idea, detail, inference, the function of a sentence or paragraph, the author’s attitude, and applying the passage’s reasoning to a new case. For every one, find the lines that support your answer before you commit. The right choice paraphrases the passage; wrong choices distort it, go further than it does, or answer a different question.
Beware of extreme language and of choices that are true in the real world but not stated in the text. Below is one full passage with its questions; try all of them before you open the explanations.
The passage
In many cities, birds of several species sing at higher minimum frequencies than do members of the same species in nearby forests. The most widely cited explanation is acoustic: urban noise, generated largely by traffic, is concentrated at low frequencies, so a bird that raises the pitch of its song escapes the band in which its signal would be masked. On this view, the shift is an adaptive adjustment that preserves communication with mates and rivals.
The explanation is attractive in part because it fits a broader pattern in animal communication, in which signals tend to be shaped by the environments through which they travel. Yet the acoustic account has usually been inferred from correlations between noise levels and song pitch, and correlations of that kind are open to other readings. City birds differ from their forest counterparts in diet, body condition, and the age structure of their populations, and any of these might affect how songs are produced. Smaller or younger birds, for instance, may be physically inclined toward higher-pitched songs regardless of what they hear.
A study of the kind that could separate these possibilities would track individual birds as noise changes around them. One research group did something close to this, recording the same males at sites where road traffic varied sharply between weekdays and weekends. If pitch were fixed by body size or age, individual birds should sing at roughly the same frequency on both occasions. Instead, the researchers reported that many males sang measurably higher on noisy days and lower on quiet ones.
This result does not settle every question. It shows that individual birds can adjust their songs in response to noise, but it cannot show whether those adjustments actually improve the chance that a song is heard, nor whether higher-pitched songs carry costs—for example, if females prefer lower songs as a mark of a larger, healthier male. The acoustic hypothesis, in short, has gained support as a description of what birds do, not yet as an account of whether doing it pays.
Aargue that the acoustic explanation of higher-pitched urban song should be abandoned in favor of an explanation based on body size
Bdescribe a study demonstrating that higher-pitched songs improve the reproductive success of urban birds
Cassess the evidence for a proposed explanation of a pattern in birdsong and identify questions that the evidence leaves open
Dcompare the singing behavior of urban birds with that of forest birds across a range of species
Eexplain why correlational studies of animal communication are generally unreliable
Show answer & explanation
Correct answer: C
Key Concept or Approach
Track the passage as a whole: paragraph 1 states the acoustic explanation, paragraph 2 notes that the correlational evidence allows other readings, paragraph 3 describes a study that supports the acoustic account, and paragraph 4 lists what that study cannot show.
Step-by-Step Solution
Step 1: Identify the task (Main Idea): Track the passage as a whole: paragraph 1 states the acoustic explanation, paragraph 2 notes that the correlational evidence allows other readings, paragraph 3 describes a study that supports the acoustic account, and paragraph 4 lists what that study cannot show.
Step 2: (C) Correct. This matches every paragraph: an explanation is evaluated against evidence (paragraphs 2-3) and the unresolved questions are named (paragraph 4, "does not settle every question").
Step 3: (A) The passage moves the other way: the weekday-weekend study counts against the body-size alternative (paragraph 3), and the acoustic hypothesis "has gained support" (paragraph 4).
Step 4: (B) Paragraph 4 says explicitly that the study cannot show whether the adjustments pay off; reproductive success is never demonstrated.
Step 5: (D) The urban-forest contrast is only the starting observation in paragraph 1; the passage is about explaining it, not cataloguing species.
Step 6: (E) Paragraph 2 says only that these particular correlations "are open to other readings"; it does not condemn correlational studies in general.
Final Answer
Answer: C
Common trap: A is tempting because paragraph 2 raises body size as an alternative, but the passage then presents evidence against that alternative rather than endorsing it.
The author mentions differences in "diet, body condition, and the age structure" of urban and forest bird populations (paragraph 2) primarily in order to
Aexplain why urban birds are generally smaller than forest birds
Bshow that urban noise affects birds in ways other than by masking their songs
Csuggest that urban birds are under greater physiological stress than forest birds
Dargue that the acoustic explanation is inconsistent with a broader pattern in animal communication
Eindicate factors that might account for the link between noise and song pitch without any role for masking
Show answer & explanation
Correct answer: E
Key Concept or Approach
Read the sentence in context: it follows the claim that correlations between noise and pitch "are open to other readings." The list supplies those other readings.
Step-by-Step Solution
Step 1: Identify the task (Function/Structure): Read the sentence in context: it follows the claim that correlations between noise and pitch "are open to other readings." The list supplies those other readings.
Step 2: (E) Correct. Diet, body condition and age could each change how songs are produced, so the observed pitch difference might arise even if noise masking played no part. That is exactly the role of the list.
Step 3: (A) The passage never says urban birds are smaller; "smaller or younger birds" is a hypothetical illustration, not a finding.
Step 4: (B) The differences in diet and age are not said to be caused by noise at all; they are alternatives to a noise-based cause.
Step 5: (C) Physiological stress is never mentioned; the author claims only that these factors "might affect how songs are produced."
Step 6: (D) Paragraph 2 says the acoustic explanation fits the broader pattern, the opposite of this choice.
Final Answer
Answer: E
Common trap: B is tempting because the list appears in a discussion of noise, but the point of the list is that these differences are independent of noise.
Reading Comprehension (RC)ScienceLong PassageApplicationVery hard
Question 3
Which of the following findings would most directly address a question that, according to the author, the weekday-weekend study leaves unresolved?
AIn a second city, individual males likewise sang at higher frequencies on days with heavy traffic than on quiet days.
BIn playback trials conducted amid recorded traffic noise, females responded about as often to higher-pitched versions of a male’s song as to lower-pitched versions.
CYounger males in urban populations sang at slightly higher frequencies than older males did, regardless of the noise level.
DThe males that adjusted their pitch the most between weekdays and weekends were, on average, larger than those that adjusted the least.
EForest-dwelling males of the same species sang at a stable frequency throughout the week.
Show answer & explanation
Correct answer: B
Key Concept or Approach
Paragraph 4 names the open questions: whether the pitch adjustments actually improve the chance that a song is heard, and whether higher songs carry costs such as reduced appeal to females. The right answer must bear on one of these, not on the question the study already answered (whether individuals adjust).
Step-by-Step Solution
Step 1: Identify the task (Application): Paragraph 4 names the open questions: whether the pitch adjustments actually improve the chance that a song is heard, and whether higher songs carry costs such as reduced appeal to females. The right answer must bear on one of these, not on the question the study already answered (whether individuals adjust).
Step 2: (B) Correct. Female responses to high versus low versions of a song amid traffic noise speak directly to whether raising pitch helps a song get through (and to whether it costs anything with females). If females respond no better to the higher version, the adjustment may not pay.
Step 3: (A) This replicates what the study already showed, that individuals adjust to noise; it adds nothing about whether adjusting pays.
Step 4: (C) This concerns the age alternative from paragraph 2, a question the weekday-weekend design was meant to handle, not one the author lists as unresolved.
Step 5: (D) Which males adjust more says nothing about whether the adjustment improves transmission or carries costs.
Step 6: (E) A forest comparison bears on whether noise is the trigger, which the study already addressed; it does not tell us whether higher songs are heard better.
Final Answer
Answer: B
Common trap: A or C feel relevant because they add data about pitch and noise, but both concern the question the study answered (do birds adjust?) rather than the one it left open (does adjusting help?).
