单选题：Paragraph 4 __________.

题目分类：卫生类
题目类型：单选题
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题目内容：

Paragraph 4 __________. 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

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It is difficult to make a film meeting the various needs of all our users.A．dive

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