单项选择题

Stage 4 sleep lasts______.

A．about 80 minutes
B．about 40-60 minutes
C．about 30 minutes
D．about 2040 minutes
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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 last and the brain becomes a little active
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
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