Central Ideas and Details questions hand you a dense little passage and ask what it's mainly saying. The free questions below train the core move: separating the claim the passage makes from the evidence it uses to make it.
Pick an answer to get instant feedback and the full worked explanation. These are real questions from the ExamNexus AI bank — the same style, length, and difficulty as the digital SAT.
Reading & Writing · Easy
Burundi packs 14m people into a territory scarcely larger than Wales or Massachusetts. Plenty of countries hold more people, and a scattering of islands and city-states are more tightly packed. Beat Burundi on both measures at once, though, and the list shrinks to Bangladesh, Taiwan and — by a whisker — Rwanda, the neighbour to its north.
According to the text, the only places that outdo Burundi in population and crowding at the same time are
Answer: A.
The text states that many countries hold more people and some places are more densely packed, but that beating Burundi on both measures at once narrows the list to Bangladesh, Taiwan and — by a whisker — Rwanda. Wales and Massachusetts appear only as size comparisons for Burundi's territory, and Kenya and Congo are named as endpoints of a crowded regional belt, not as places that surpass Burundi on both counts.
Score tip: When a stem repeats a qualifying phrase like 'both measures at once', find the sentence built around that exact qualifier — nearby place names used for other comparisons are the intended traps.
Reading & Writing · Medium
At home, the picture inverts. France opened 2026 exactly as it opened 2025: without a budget for the new year, without a parliamentary majority and without any assurance that its government would last. A year ago the centrist prime minister, François Bayrou, was improvising his way forward until September, when parliament threw him out in a fight over the 2026 budget. His replacement, Sébastien Lecornu, has now lasted four months — but only by temporarily extending the previous year's budget in December, once his own draft died in a deadlocked legislature. He hopes to pass a proper budget before January ends.
Which choice best states the main idea of the text?
Answer: A.
The text's opening frames its point: France began 2026 exactly as it began 2025 — no budget, no majority, no guarantee of survival — and the sentences that follow illustrate that continuity through Bayrou's fall and Lecornu's stopgap. Bayrou's removal is one supporting detail, not the governing idea; the text notes Lecornu has lasted four months without judging him more durable overall; and the text expresses uncertainty about the government's survival, not certainty of collapse.
Score tip: The main idea must cover the whole passage — test each option by asking whether every sentence helps establish it; options built on one sentence or exceeding the text's stated confidence fail that test.
Reading & Writing · Hard
Posted to Jordan as the U.S. ambassador, she worked to calm the host government's alarm over a conflict elsewhere in the region and helped arrange the delivery of humanitarian aid to a neighboring territory. By long custom, ambassadors offer their resignations whenever an administration changes, and by equally long custom those offers are declined. Hers, to her surprise, was accepted on January 20, 2025, without a word of explanation. After two decades of service spanning administrations of both parties, she decided her career had reached its end, and in August she resigned.
Which choice best states the main idea of the text?
Answer: B.
The passage explains that ambassadors' turn-of-administration resignations are normally rejected, that Lempert's was surprisingly accepted without explanation, and that she later left government — the arc B captures. Choice A invents a diplomatic failure the text does not mention. Choice C contradicts the text, which says her resignation was accepted, not declined. Choice D misstates the timeline and adds a public explanation the passage never reports.
Score tip: A main-idea answer must square with the sequence given; reject options that invent a cause, reverse the outcome (accepted vs. declined), or add an explanation the text withholds.
Registered students practice this skill from a bank of thousands of questions, with adaptive difficulty, instant scoring, and an explanation for every answer.
How the SAT tests this skill
These questions come in two flavors: "which choice best states the main idea" and "according to the text, what is true about X." Both are answered strictly from the passage — outside knowledge is not just unnecessary, it's where the trap answers come from.
Wrong answers follow a pattern worth memorizing: too specific (a real detail promoted to main idea), too broad (true of the topic but not this text), or a subtle distortion that swaps who did what. The correct answer often feels boring — it just restates the passage without improvement.
Stating the main idea of a 50–120 word academic passage
Locating specific details without importing outside knowledge
Rejecting too-specific, too-broad, and distorted choices
Pro tip: After reading, finish the sentence "the author's point is that…" before touching the choices. If an answer is true but doesn't complete that sentence, it's a detail, not the idea.
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