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 this passage, sleep is described as __________.
A．drowning in an ocean of darkness
B．undisturbed by tension or problems
C．a gradual parting from the real world
D．dependent only upon individual age and health
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