单项选择题

It goes without saying that pollution （） a serious threat to the continued existence of some species living on earth.

A. poses
B. imposes
C. provokes
D. evokes

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单项选择题
Our country（）the largest wheat harvest in its history last year.

A. yielded
B. submitted
C. generated
D. compromised
单项选择题
People were surprised to find that he had the ability to（）everything he was involved in.

A. precede
B. dominate
C. effect
D. instruct
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