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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单项选择题
（37）（）

A. coping
B. forcing
C. dealing
D. tackling
单项选择题
The inventor（）his original design in order to increase the machine’s efficiency.

A. executed
B. modified
C. cultivated
D. decorated
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