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 last and the brain becomes a little active

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单项选择题

In the second paragraph the word dart means ______.A. glare C. stop movingB. move rapidly or suddenly D. gaze

A．move rapidly or suddenly
B．gaze
C．stop moving
D．In the second paragraph the word "dart" means ______.
E．glare