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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单项选择题

The comment made by the author of this passage on Tan's writing tends to be______.

A．sarcastic
B．poignant
C．laudatory
D．critical

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