单项选择题

According to the passage, the scanner is like ______.

A．your brain
B．voice synthesizer
C．a photocopy machine
D．a signal
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单项选择题
Which of the following is the best title of the passage
A．Sleep.
B．Good health.
C．Dreams.
D．Work and Rest.
单项选择题
During REM, ______.
A．your eyes move quickly
B．you dream
C．you breathe slowly
D．both A and B
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