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
In the second paragraph the word dart means______.A. glareC. stop movingB. move rapidly or suddenlyD. gaze
A．move rapidly or suddenly
B．gaze
C．stop moving
D．In the second paragraph the word "dart" means______.
E．glare
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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