When sometimes they cannot enjoy adequate sleep, the long sleepers might ( ).
- A appear disturbed
- B become energetic
- C feel dissatisfied
- D be extremely depressed
问题
When sometimes they cannot enjoy adequ
参考解析：
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。
分类：其他
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