单项选择题

We can （） gestures correctly only if we are familiar with the customs and conventions of the people who use them.

A. interpret
B. exchange
C. define
D. resolve

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单项选择题
The （） of this policy would relieve the unions of a tremendous burden.

A. reference
B. adoption
C. assumption
D. innovation
单项选择题
The plane found the spot and hovered close enough to （） that it was a car.

A. ensure
B. examine
C. verify
D. testify
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