单项选择题

They made detailed investigations to () themselves with the needs of the rural market.

A. adhere
B. acknowledge
C. acquaint
D. activate

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单项选择题
We are writing to the manager () the repairs recently carried out at the above address.

A. with the exception of
B. with the purpose of
C. with reference to
D. with a view to
单项选择题
Radar is used to extend the ()of man's senses for observing his environment, especially the sense of vision.

A. validity
B. liability
C. capacity
D. intensity
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