单项选择题

He was one of the principal organizers of the association.

A. planners
B. employees
C. actors
D. recipients
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单项选择题
It is postulated that population trends have an effect on economic fluctuations.
A. challenged
B. assumed
C. deducted
D. decreed
单项选择题
This kind of animals are on the verge of extinction, because so many are being killed for their fur.
A. drying up

B. dying out
C. being exported

D. being transplanted
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