单项选择题

It is estimated that, currently, about 50000 species become （）every year.

A. extinct
B. instinct
C. distinct
D. intense

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单项选择题
We hoped to be able to get married early this month, but things didn't （）as we had expected.

A. work out
B. come by
C. fill up
D. lay down
单项选择题
The government （） a heavy tax on tobacco, which aroused opposition from the tobacco industry.

A. pronounced
B. imposed
C. composed
D. prescribed
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