单项选择题

To help students understand how we see, teachers often draw an _______ between an eye and a camera.

A．axis
B．image
C．imitation
D．analogy
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单项选择题
The author of the report is well _______ with the problems in the hospital because he has been working there for many years.
A．acquainted
B．known
C．informed
D．accustomed
单项选择题
Be sure not to _______ his help. Do it all by yourself.
A．account for
B．press for
C．call on
D．reckon on
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