单项选择题
During REM, ______.
A．your eyes move quickly
B．you dream
C．you are restless
D．both A and B
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单项选择题
A good title for this passage is ______.
A．Sleep
B．Good Health
C．Dreams
D．Work and Rest
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单项选择题
What does the author see as the function of the universe's unseen switches
A．They tell us which one of the tracks the universe will use.
B．They enable us to alter the course of t he universe.
C．They give us information about the lunar surface.
D．They determine which course the universe will take in the future.
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