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
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
单项选择题
According to the passage, which of the following is NOT a characteristic of REM sleep
A．The eyes dart around.
B．It lasts 8 to 15 minutes.
C．The delta rhythm is present.
D．The sleeper dreams.
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