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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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.
单项选择题
The reforms that Horace Mann achieved were ______.
A．not very radical for the time
B．used only by the state of Massachusetts
C．enforced by the Massachusetts bar
D．later adopted as a model for the nation's educational system
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