单项选择题

The author wrote this passage in order to ______.

A．introduce a kind of reading machine
B．show the uses of computers
C．give advice for blind people
D．explain why the machine is important for blind people

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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