单项选择题


A．yet
B．also
C．alone
D．only
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单项选择题
The term subjects (line 7, para. 3) refers to ______.
A．waves
B．dreams
C．volunteers
D．instruments
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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