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 2 ______.

【参考答案】

E
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