单项选择题In what respect are humans and animals alike in sleep
A．For both of theme only fatigue can promote sleep.
B．For both of them, overeating may promote sleep.
C．For both of them, they wake only to satisfy their bodily needs.
D．For both of them, they need to be completely satisfied to promote sleep.
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1.单项选择题The author of the passage may believe that______.
A．insufficient sleep may become dangerous to our civilization
B．excess of sleep may cause a loss to the community
C．we do not need as much sleep as we take
D．deprivation of sleep in emergencies may do no harm to our body
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