单项选择题

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

A．waves
B．dreams
C．volunteers
D．instruments
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单项选择题
All of the following Were suggested as being used by sleep researchers EXCEPT ______.
A．electrodes
B．hypnosis
C．charts
D．recorders
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
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