In a reading passage, how can you quickly determine the author's main idea?

• A. Read only the last paragraph.
• B. Focus on marginal notes.
• C. Count the number of citations.
• D. Read the introduction and conclusion or topic sentences, and look for recurring motifs or thesis statements.

Answer: (D)

When trying to find the author's main idea, start by identifying the central claim or purpose the author is conveying. Check the opening to see if the author states a thesis or clear aim, and then look to the conclusion to see if that main point is summarized or reinforced. Reading the topic sentences in each paragraph helps confirm how the author develops that idea, since those sentences usually point to the main point of each section and tie back to the overall argument. Also watch for recurring motifs or statements that keep returning; these threads often signal the core message the author wants you to take away.

This approach works because the author typically builds a central claim from the outset, supports it throughout the body, and returns to it in the close. By connecting the introduction, topic sentences, and conclusion, you get a coherent picture of what the passage is arguing or explaining.

Other options don’t reliably reveal the main idea. Relying on just the last paragraph can miss earlier setup or the full scope of the argument. Marginal notes reflect someone’s interpretation or summary, not the author’s own main point. Counting citations doesn’t indicate what the author believes is most important, since citations show sources rather than the central claim itself.