单项选择题

From this material we can ______ hundreds of what you may call direct products.

A．displace
B．derive
C．diminish
D．discern
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单项选择题
In spite of his breakdowns, he achieved a position of seniority and in due course retired with a ______.
A．salary
B．earning
C．pension
D．donation
单项选择题
You very likely give other passengers a quick glance to size them up and to ______ them that you mean no threat.
A．issue
B．assure
C．certify
D．rectify
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