2. 外语
  3. A、They are more health-conscious. B、They are changing their living habits. C、They get less and less sleep. D、They know the dange

A、They are more health-conscious. B、They are changing their living habits. C、They get less and less sleep. D、They know the dange

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问题
选项 A、They are more health-conscious.
B、They are changing their living habits.
C、They get less and less sleep.
D、They know the dangers of lack of sleep.
答案C
解析 细节推断题。短文首先阐明了人们睡眠减少的事实，随后以美国人的睡眠时间为例进行说明。20世纪50年代，人们的平均睡眠时间是8小时，近几年平均睡眠时间是7小时，40％的美国人睡眠时间甚至不足7小时。由此可知，当今美国人的睡眠时间越来越少。
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大学英语四级

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