When sometimes they cannot enjoy adequate sleep the long sleepers might ().A. appear dis

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When sometimes they cannot enjoy adequate sleep, the long sleepers might ().

A. appear disturbed

B. become energetic

C. feel dissatisfied

D. be extremely depressed

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  • 正确答案:A
    A [解析]根据第五段中的“…were quite concerned when they were occasionally deprived of their desired 9 hours of nightly bed rest”可知,偶尔缺少了他们所需的9个小时的夜间卧床休息,睡眠多的人便会十分不安。A项是“quite concerned”的同义替换,B项“变得精力旺盛”与文意不符;C项“感到不满”的程度此文意轻;D项“极度沮丧”的程度比文意重。