A.Kripike’s research tool. B.Dangers of habitual shortages of sleep. C.Criticism on Kripke’s report. D.A way of overcoming insom

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问题 A.Kripike’s research tool.
B.Dangers of habitual shortages of sleep.
C.Criticism on Kripke’s report.
D.A way of overcoming insomnia.
E.Sleep problems of long and short sleepers.
F.Classification of sleep problems.
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选项

答案B

解析 段落的结构Previous studies have shown the potential dangers of chronic shortages of sleep — for instance...表明了该段的中心是讲述“长期睡眠不足的潜在危险”。
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