填空题

A. Kripke’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

Paragraph 4 ______.

【参考答案】

B

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A. Kripke’s research toolB. Dangers of habitual shortages of sleepC. Criticism on Kripke’s reportD. A way of overcoming insomniaE. Sleep problems of long and short sleepersF. Classification of sleep problems Paragraph 4 ______.