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
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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.
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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