填空题

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
Paragraph 5 ______.

【参考答案】

A
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填空题
Paragraph 4 ______.