单项选择题

The brain waves are the slowest during______.

A．stage 1
B．stage 2 and stage 3
C．stage 4
D．REM sleep
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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
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
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