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单项选择题
According to the author, the alpha state has been shown to be
A．immeasurable.
B．erratic in its rhythm.
C．a brief burst of activity in the brain.
D．controllable.
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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