单项选择题

It can be inferred from the passage that______.

A．different people may have quite different sleep requirements
B．we can leave our bodies to regulate our sleep requirement for itself
C．we can maintain normal behavior and working standards no matter how mueh we have slept
D．we may remain efficient even if we have one night's loss of sleep
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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.
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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