单项选择题

It can be inferred from the passage that stages of sleep are primarily classified according to ______.

A．breathing rhythms
B．muscular movement
C．dreaming patterns
D．brain wave activity
<上一题 目录 下一题>
热门 试题

单项选择题
According to the passage, the alpha rhythm is the characteristic of which phase of sleep
A．Stage 1.
B．Stage 2.
C．Stage 3.
D．Stage 4.
单项选择题
After how many minutes does an average person repeat the sleep cycle
A．8 to 15 minutes.
B．30 minutes.
C．40 to 60 minutes.
D．80 minutes.
相关试题