问题
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What is the main purpose of the passage?A.To outline the research findings on the brain st
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How did the researchers carry out their study?A.They studied the findings of several previ
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What did the researchers discover in northern Kenya?A.A human tooth.B.A human skull.C.Thre
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According to the passage, what problem does the recent research find?A.Sleep shortage has
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In what kind of areas do researchers find high caffeine levels?A.Areas near wastewater tre
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What did the researchers find in their study of f