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
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
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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