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

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热门试题

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

单项选择题

The term subjects (line 7, para. 3) refers to ______.

A．waves
B．dreams
C．volunteers
D．instruments