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
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
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.
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