单项选择题

Which of the following does the passage mainly discuss

A．Scientific methods of studying sleep.
B．Why humans require sleep.
C．The phases of sleep.
D．Why dreams occur during REM sleep.
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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
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
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