单项选择题

Many summer insomniacs ______.

A．can't make up for the sleepless nights
B．sleep in the afternoons
C．can get extra sleep at night
D．can never sleep well
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单项选择题
Lack of sleep can lead to ______.
A．a sudden change in lifestyle
B．good bodily condition
C．the habit of falling asleep in front of the television
D．a quick drop in both physical and mental condition
单项选择题
From the passage, insomnia results from ______.
A．interruption of the ordinary sleep pattern
B．being unable to sleep
C．keeping awake at night
D．drugs to treat a special disease
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