A. Keprike’s research tool B. Dangers of Habitual shortages of sleep C. Criticism on Kripke’s report D. A way of overcoming inso

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问题 A. Keprike’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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