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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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
单项选择题
（37）（）

A. coping
B. forcing
C. dealing
D. tackling
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