Which of the following best describes the function of the sentence in lines 14-16 ("Certainly... sleep")?
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The primary purpose of the passage is to
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According to the author of the passage, which of the following generalizations about memory and sleep is true?
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In the context in which it appears, "shades" (line 2) most nearly means
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The passage suggests that Glass`s work displays which of the following qualities?
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The passage implies that during the day before a night on which a male nightingale`s song rate is high, that nightingale probably does which of the following?
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It can be inferred from the passage that compared with other costs of singing, which of the following is true of the energy costs of singing?
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