单项选择题

In a period of （） when almost everyone has a job, many people become too optimistic.

A. productivity
B. proficiency
C. proximity
D. prosperity

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单项选择题
Because of the unpredictable nature of auto accidents, even a careful driver stands the chance of becoming involved, innocently or otherwise, in a （）

A. collision
B. complication
C. concession
D. conviction
单项选择题
Retailers and manufacturers tend to organize differently to accomplish their advertising（）

A. objectives
B. engagements
C. commodities
D. segments
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