A Kripke’s Research Too1 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  Kripke’s Research Too1
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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答案A

解析 第五段介绍了Kripke的调查工具(tool)。他用的是有关睡眠的问卷;问卷包括两大内容:睡眠时间及睡眠困扰问题。
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