单项选择题

The suspect's movements were under the close ______ of the police.

A．velocity
B．security
C．scrutiny
D．symmetry
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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
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
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