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A a long afternoon nap B the peak production of melatonin C poor health D low sleep efficiency E good sleep efficiency F exposur
A a long afternoon nap B the peak production of melatonin C poor health D low sleep efficiency E good sleep efficiency F exposur
admin
2016-08-16
50
问题
A a long afternoon nap
B the peak production of melatonin
C poor health
D low sleep efficiency
E good sleep efficiency
F exposure to blue light
The tiredness in the morning even after many hours in bed is due to______.
选项
答案
D
解析
句意:即使晚上睡了很久,但早上还是感觉疲倦,这是因为睡眠效率低。根据首段“your sleep efficiency is not that good”可知,即使睡得时间长还是会觉得疲倦的原因是睡眠效率低。故选D。
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本试题收录于:
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