单项选择题
In the second paragraph the word "dart" means______.
A. glare
C. stop moving
B. 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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单项选择题
Stage 4 sleep lasts______.
A.about 80 minutes
B.about 40-60 minutes
C.about 30 minutes
D.about 20-40 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 fast and the brain becomes a little active
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