The passage explains how desert plants use seed dormancy as a survival strategy, waiting for specific moisture conditions before germinating rather than sprouting after any rainfall. The text develops this main idea by detailing the precise conditions needed (extended moisture, not just brief rain) and additional factors like temperature patterns, while clarifying that seed dispersal doesn't control timing. Choice A focuses on a minor detail about animal dispersal. Choice C misidentifies hot winds as a cause of plant failure rather than a condition preventing germination. Choice D incorrectly limits germination to one season when the text only says the temperature pattern is "common" in early spring. For central idea questions, ask what concept the passage spends the most time explaining—here, it's dormancy as an adaptive strategy.

The passage's central argument is that protected bike lanes are 'not a "cosmetic" change but a safety intervention that alters driver behavior,' with the conclusion that 'predictable separation reduces collisions more reliably than education campaigns alone.' The text develops this idea by showing how the lanes changed turning speeds and reduced conflicts, demonstrating their safety impact through behavioral changes. Choice B incorrectly attributes ridership increases solely to weather, which the text mentions as only one possible factor. Choice C overstates the role of flexible posts as the 'only' method. Choice D misrepresents the critics' concerns as the main focus. The passage consistently emphasizes safety through infrastructure that changes behavior, making A the clear central idea.

The central idea of the text is that librarian Aria Bell used a request ledger to track patron needs and align the library's collection with the community's evolving workforce demands. The passage describes the ledger's role in noting small fixes like lighting and hours, but it repeatedly emphasizes Bell's focus on acquiring practical texts, such as technical manuals for apprentices, while still accepting but deprioritizing less essential donations like poetry volumes. This scope shows how the text builds from specific examples to illustrate Bell's broader goal of making the library more relevant to users' daily lives. A key distractor is choice A, which highlights minor improvements like lighting and hours, but these are presented as small fixes rather than the text's main emphasis on adapting the collection to community needs. In central idea questions, ask yourself what the author returns to repeatedly—that's usually the central idea, not the supporting details.

The central idea of the text is that engineer Keiko Tanaka responded to setbacks during a bridge project by redirecting work and turning delays into productive opportunities, a habit emphasized by her biographer. The passage details specific examples, such as reassigning crews during steel flaws and using wind delays for safety drills and manual revisions, highlighting her adaptive approach over pure technical skill. This scope builds from individual incidents to the biographer's broader praise for her mindset in managing obstacles. A key distractor is choice A, which attributes success mainly to improved weather, but the text focuses on Tanaka's proactive responses rather than external factors like weather. In central idea questions, pay attention to what the biographer or narrator emphasizes—that usually signals the main point beyond the events themselves.

The passage reveals the novelist's concern that critics would misinterpret her book as a simple mystery when she intended something deeper. She explicitly considers the mystery elements (missing heirloom, suspicious neighbor) as mere 'handles' for readers, not the story's point. What truly mattered to her was 'how the narrator's voice changes as trust erodes within a family' - focusing on shifting relationships and character development. Even the final reveal was designed to show character psychology rather than surprise readers. Choice A correctly identifies this emphasis on relationships over plot, while other choices misrepresent or overstate aspects of the author's intent.

The passage describes a library renovation focused on improving usability and patron experience rather than simply expanding the collection. The text provides specific examples: moving the reference desk closer to the entrance for easier access and replacing silent study areas with reservable rooms for tutoring. The director explicitly stated the goal was 'to make the building easier to use rather than more impressive to look at,' which directly supports choice A's emphasis on reorganizing spaces for patron usability. Choices B and D contradict the passage's stated goals, while C overstates the tutoring room addition as a complete replacement philosophy.

The passage presents the professor's argument that setting functions as an active force in narrative by creating constraints and pressures that shape characters' decisions and actions. The text develops this idea through the example of a coastal fishing town where storms aren't just weather but economic threats that "reshape friendships and decisions," showing how environment limits "what the characters can risk." Choice A focuses on minor textural details that the passage explicitly says "do not drive the plot." Choice B is too narrow and literal about storms. Choice D introduces teaching objectives never mentioned in the passage. When identifying the main idea, focus on the concept the author returns to and emphasizes—here, it's setting as an active, constraining force.

The central idea of the text is that different preserved documents led two towns to remember one 1779 protest differently, as examined by historian Marisol Vega. The passage as a whole focuses on contrasting memories in Harborview (as a turning point) and Ridgefield (as quiet), explained by the types of sources each preserved, like merchants' letters versus a minister's diary. It argues that community memory follows protected documents rather than the event's scale. Choice A is a tempting distractor because it overstates the protest's impact as causing policy in every town, but the text limits this to Harborview's perspective without claiming universality. In central idea questions, look for the author's main argument, such as how documents shape memory, rather than exaggerated effects.

The text is mainly about how novelist Priya Banerjee used slow read-aloud walks to identify and fix rhythmic issues in her drafts. The passage as a whole focuses on her method of walking to reveal awkward sentences, marking breath points in 2020 revisions, and drawing from actors' techniques, while still incorporating desk editing. It portrays the walks as a practical tool despite friends' skepticism. Choice D is a distractor because it claims desk editing replaced walking, but the text says she credited walks with finding unique problems and continued using them. In questions about what the text is mainly about, identify the core practice emphasized, such as the walking revisions, rather than minor contrasts or misconceptions.

The information about why the conservators recommended the synthetic varnish appears in the second and fourth sentences, where the text compares the varnishes' performance over time and states the recommendation for bright galleries. The text explains that 'after six months under controlled light, the resin sample yellowed slightly while the synthetic sample stayed clearer,' indicating reduced yellowing as the primary reason. Choices A and C misread details, as the synthetic is actually harder to remove and the test was on a panel, not guaranteeing a better match to the original; choice D confuses the initial equal restoration of saturation with long-term effects. In detail questions, watch for answer choices that mix accurate details from different parts of the passage in misleading ways, such as conflating short-term and long-term outcomes.