Central Ideas and Details Flashcards

Read this passage: 'Microplastics — fragments smaller than 5 millimeters — have been detected in the deepest ocean trenches, the highest mountain peaks, and even in human blood. They originate from the breakdown of larger plastic products and from microbeads in personal care items. Scientists are urgently investigating their long-term health effects.' What is the central idea?

Answer: Microplastics are a pervasive and potentially dangerous environmental contaminant under active scientific investigation

The passage covers the ubiquity of microplastics, their origins, and ongoing concern about health — all aspects captured in choice C.

A passage states: 'The Renaissance, beginning in 14th-century Italy, marked a renewed interest in classical Greek and Roman culture, philosophy, and art. Scholars called humanists shifted focus from purely religious concerns to human potential and achievement. This intellectual revolution spread across Europe, transforming art, literature, science, and politics.' Which best states the central claim?

Answer: The Renaissance was a broad intellectual transformation that redirected European culture toward human-centered values

The passage describes the Renaissance as a wide-ranging shift toward human-centered thought affecting many domains — captured in choice C.

Read: 'The human gut contains trillions of microorganisms — bacteria, viruses, and fungi — collectively called the microbiome. Research links gut microbiome health to immunity, mental health, and metabolic function. Diet, particularly fiber intake, profoundly shapes microbiome composition.' What detail best supports the idea that the microbiome is important to overall health?

Answer: The microbiome influences immunity, mental health, and metabolism

Linking the microbiome to immunity, mental health, and metabolic function directly supports its importance to overall health.

Read this passage: 'Thomas Edison did not invent the lightbulb outright; he improved an existing technology. Earlier inventors had created bulbs that burned out quickly or required impractical power sources. Edison's contribution was developing a long-lasting, practical filament and a complete electrical distribution system that made electric lighting commercially viable.' What is the main idea?

Answer: Edison's true achievement was making electric lighting practical and commercially available

The passage emphasizes that Edison's contribution was making lighting practical and commercially viable — not merely inventing the bulb.

A passage reads: 'Languages die when their last native speakers die. Currently, linguists estimate that one language becomes extinct every two weeks. Of the roughly 7,000 languages spoken today, at least half are expected to vanish by 2100. Each extinct language represents an irreplaceable loss of cultural heritage and unique ways of understanding the world.' What is the central idea?

Answer: Languages are dying at an alarming rate, and each loss represents an irreplaceable cultural and cognitive loss

The passage conveys both the alarming rate of language death and the significance of each loss — both aspects appear in choice A.

Read: 'The Harlem Renaissance of the 1920s and 1930s was an explosion of African American artistic, literary, and intellectual life centered in New York City. Writers like Langston Hughes and Zora Neale Hurston produced landmark works, while jazz and blues musicians transformed American music. The movement gave African Americans a powerful cultural voice during an era of racial oppression.' Which statement best summarizes the passage?

Answer: The Harlem Renaissance was a vibrant cultural movement that empowered African Americans during a period of oppression

The passage describes a broad cultural flowering that had political and social significance — giving African Americans a cultural voice — which choice B captures.

Read this: 'Vaccines work by training the immune system to recognize and fight specific pathogens. They introduce a harmless version or component of a pathogen, prompting the immune system to produce antibodies. If the vaccinated person later encounters the real pathogen, their immune system responds rapidly, preventing serious illness.' What is the central claim?

Answer: Vaccines protect individuals by pre-training the immune system to respond quickly to real infections

The passage explains the full mechanism: vaccines train the immune system so it responds effectively when real infection occurs — the protective outcome is the central claim.

A passage states: 'The Great Wall of China was not built all at once; it was constructed in sections over many centuries by different Chinese states and dynasties. The earliest walls date to the 7th century BCE, while the most famous sections were built during the Ming Dynasty (1368–1644). The wall served primarily as a military defense system but also facilitated trade and communication.' What supporting detail best backs the idea that the Great Wall had multiple purposes?

Answer: The wall served as military defense and also facilitated trade and communication

The statement that the wall served both military and economic/communicative functions directly supports the claim of multiple purposes.