2. 自考
  3. Task 2 A. a daily energy cycle B. at your low point C. habitually staying up later D. husbands and wives E. at it

Task 2 A. a daily energy cycle B. at your low point C. habitually staying up later D. husbands and wives E. at it

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问题    Task 2
   A. a daily energy cycle
   B. at your low point
   C. habitually staying up later
   D. husbands and wives
   E. at its peak
   F. your energy cycle
Dr. Kleitman has proved that everyone has______.
选项
答案A
解析 根据文中第一段最后一句可知，Dr．Kleitman提出了一种解释因早上起床困难而感到痛苦的新说法，那就是每个人都有能量周期。由此可以推断出答案为A。
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