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SAT Reading & Writing: Central Ideas and Details (Drill 2)

Drill 2 · Reading & Writing · Central Ideas and Details

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About This Drill

SAT Reading & Writing: Central Ideas and Details (Drill 2) is a Reading & Writing practice drill covering Central Ideas and Details. It contains 5 original questions created by Brian Stewart, a Barron's test prep author with over 20 years of tutoring experience.

Central Ideas and Details questions ask you to identify the main idea of a text and determine what a detail contributes to it. This drill emphasizes the distinction between what a passage states explicitly and what it implies, a common source of wrong-answer traps.

Questions & Explanations

Text
Archaeologist Sarah Parcak has pioneered the use of satellite imagery to locate buried archaeological sites. Using infrared sensors aboard orbiting satellites, Parcak can detect subtle differences in soil composition and vegetation patterns that indicate the presence of structures beneath the surface. Her technique has identified thousands of potential sites across Egypt alone, including what appear to be seventeen previously unknown pyramids. Parcak has argued that satellite archaeology could transform the field by allowing researchers to survey vast areas rapidly and prioritize the most promising locations for excavation.

Question 1. Which choice best states the main idea of the text?

  • A) Parcak believes that traditional excavation methods should be replaced entirely by satellite-based techniques.
  • B) Parcak has developed a satellite-based approach to archaeology that has revealed numerous previously unknown sites and could change how the field operates. ✓
  • C) Parcak’s satellite imagery has proven that there are exactly seventeen undiscovered pyramids in Egypt.
  • D) Satellite technology is primarily useful for studying Egyptian archaeology but has limited application elsewhere.

Explanation: Choice B is the best answer. The text describes Parcak’s satellite technique, its discoveries (including potential pyramids), and her argument that it could ‘transform the field.’ Choice A doesn't fit: the text says satellite archaeology helps prioritize excavation, not replace it. Choice C is wrong because the text says ‘what appear to be’ seventeen pyramids, not a confirmed count. Choice D doesn't work because the text mentions Egypt as one example but doesn’t limit the technique’s application.

Text
The following text is adapted from Leo Tolstoy’s 1877 novel Anna Karenina (translated by Constance Garnett). Levin, a landowner, has just begun mowing a meadow alongside his peasant workers. The longer Levin mowed, the oftener he felt the moments of unconsciousness in which it seemed not his hands that swung the scythe, but the scythe mowing of itself, a body full of life and consciousness of its own, and as though by magic, without thinking of it, the work turned out regular and precise. These were the most blissful moments.

Question 2. According to the text, what does Levin experience while mowing?

  • A) He becomes frustrated with the difficulty of keeping pace with the other workers.
  • B) He enters a state of effortless absorption in which the work seems to happen on its own. ✓
  • C) He realizes that the peasant workers are far more skilled at mowing than he is.
  • D) He decides that physical labor is preferable to managing his estate from indoors as the passage presents it.

Explanation: Choice B is the best answer. The text describes ‘moments of unconsciousness’ in which the scythe seemed to move ‘of itself’ and the work was ‘regular and precise’ without conscious effort. These are called ‘the most blissful moments.’ Choice A doesn't fit: Levin is not frustrated. Choice C is wrong because no comparison to other workers’ skill is made. Choice D doesn't work because no decision about preferring labor to management is described.

Text
Linguist Dr. Anya Petrova and her team studied the speech patterns of bilingual children who grow up speaking both Russian and English at home. The researchers found that these children frequently switch between languages mid-sentence, called code-switching. Petrova’s analysis revealed that the switches are not random but follow consistent grammatical rules: children almost never switch languages at points where doing so would violate the grammatical structure of either language. Petrova concluded that code-switching reflects sophisticated linguistic competence rather than confusion or deficiency.

Question 3. What does the text indicate about code-switching in bilingual children?

  • A) It occurs because children have not yet fully learned the grammar of either language.
  • B) It follows systematic grammatical patterns, suggesting a high level of linguistic skill. ✓
  • C) It happens more frequently in children who speak Russian than in those who speak English.
  • D) It is discouraged by most linguists because it can slow language development.

Explanation: Choice B is the best answer. The text states that code-switches ‘follow consistent grammatical rules’ and that Petrova concluded this reflects ‘sophisticated linguistic competence rather than confusion or deficiency.’ Choice A contradicts the text’s conclusion. Choice C doesn't fit: no comparison between Russian-speaking and English-speaking children is made. Choice D is wrong because the text presents code-switching positively, not as something discouraged.

Text
The following text is adapted from Charles Dickens’s 1860 novel Great Expectations. The narrator, Pip, describes his visit to Miss Havisham’s house. No glimpse of daylight was to be seen in it. It was a dressing-room, as I supposed from the furniture, though much of it was of forms and uses then quite unknown to me. But prominent in it was a draped table with a gilded looking-glass, and that I made out at first sight to be a fine lady’s dressing-table. Whether I should have made out this object so soon if there had been no fine lady sitting at it, I cannot say. In an arm-chair, with an elbow resting on the table and her head leaning on that hand, sat the strangest lady I have ever seen, or shall ever see.

Question 4. Based on the text, what is Pip’s reaction upon seeing Miss Havisham?

  • A) He is struck by how unusual she appears. ✓
  • B) He is relieved to find someone in the dark room.
  • C) He is impressed by the elegance of her clothing.
  • D) He is frightened and wants to leave immediately.

Explanation: Choice A is the best answer. Pip describes Miss Havisham as ‘the strangest lady I have ever seen, or shall ever see,’ indicating that he is struck by how unusual she appears. Choice B doesn't fit: no relief is expressed. Choice C is wrong because no comment on her clothing’s elegance is made. Choice D doesn't work because while the scene is eerie, Pip does not express fear or a desire to leave.

Text
For decades, neuroscientists believed that adult human brains could not generate new neurons, a process called neurogenesis. However, research by Maura Boldrini and colleagues at Columbia University challenged this assumption. Boldrini’s team examined post-mortem brain tissue from twenty-eight healthy individuals aged 14 to 79 and found evidence of new neuron production in the hippocampus across all age groups. The researchers did observe that older brains showed reduced blood vessel formation in the hippocampus, which may affect how well new neurons integrate into existing neural networks.

Question 5. Based on the text, what did Boldrini’s research reveal about neurogenesis?

  • A) It occurs in the hippocampus even in older adults, though related blood vessel formation declines with age. ✓
  • B) It was previously thought to occur only in children but has now been observed in teenagers as well, as the passage indicates.
  • C) It is more active in older adults than in younger individuals, contrary to earlier assumptions.
  • D) It cannot be accurately studied using post-mortem brain tissue.

Explanation: Choice A is the best answer. The text states that new neuron production was found ‘across all age groups’ but that ‘older brains showed reduced blood vessel formation.’ Choice B is off because the earlier assumption was that adults could not generate new neurons at all, not that only children could. Choice C doesn't fit: the text says neurogenesis occurs across all ages but that blood vessel formation declines, not that neurogenesis increases with age. Choice D contradicts the study, which used post-mortem tissue successfully.