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
<上一题 目录 下一题>
热门 试题

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
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
相关试题