单项选择题

According to the passage, which of the following contributes little to the study of sleep

A．Advancement in neurophysiological measurement.
B．Improvement in experimental psychology.
C．Studies of the electrical potentials of the brain.
D．Experiments of physiological changes in the body.
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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
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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