The best places to find clues to the central idea of a passage are:
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The title - The title often encapsulates the main theme or focus of the passage, providing a strong indication of what to expect.
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The headings and subheadings - These elements typically break down the main ideas into sections, highlighting the primary topics discussed in the passage.
The other options, such as the date of publication, glossary, and the spelling of the author's name, are not directly relevant to identifying the central idea of a passage.