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.
<上一题 目录 下一题>
热门 试题

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.
单项选择题
The word radical in the third paragraph is closest in meaning to ______.
A．equal
B．extreme
C．excellent
D．basic
相关试题