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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Williams had not been there during the ______ moments when the kidnapping had taken place.
A. superior
B. rigorous
C. vital
D. unique
单项选择题
I managed to talk down the price and bought the coat （）the discount of 20 percent.

A. for
B. with
C. on
D. at
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