单项选择题

Sleep is described as ______.

A．a gradual parting from the real world
B．undisturbed by tension or problems
C．drowning in an ocean of darkness
D．dependent only Upon individual age and health

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热门试题

单项选择题

This passage states than a person is really asleep only ______.

A．after dreaming has stopped
B．when his EEG reveals no alpha rhythm
C．when his EEG begins to show an alpha rhythm
D．after the completion of his alpha rhythm decline

单项选择题

According to the author, the alpha state has been shown to be ______.

A．unmeasurable
B．a brief burst of activity in the brain
C．unpleasant for some people
D．comtrollable