单项选择题

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

A．unmeasurable
B．controllable
C．unpleasant for some people
D．a brief burst of activity in the brain
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单项选择题
The word subject (Line 1, Para; 3) refers to __________.
A．measurement
B．instrument
C．dream
D．volunteer
单项选择题
According to the passage, what was used by sleep researchers
A．Music.
B．Ladder.
C．Charts.
D．Signature.
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