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

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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
单项选择题
Many firms give small quantities of their products as（）so that people can try them before buying.

A. synthesis
B. samples
C. commodities
D. instances
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