单项选择题

The stages of sleep take on______.

A．an irregular aspect.
B．a regular aspect
C．a punctual aspect
D．a similar aspect
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单项选择题
One of the features of REM sleep is that______.
A．there are large slow waves, though rapid for the first few minutes
B．you have the deepest sleep
C．there are no brain waves
D．the brain waves are a little fast and the brain becomes a little active
单项选择题
In the second paragraph the word dart means______.
A．glare
B．stop moving
C．move rapidly or suddenly
D．gaze
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