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

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问题 It is estimated that, currently, about 50000 species become ______ every year.

选项 A、extinct
B、instinct
C、distinct
D、intense

答案A

解析本题考点为形容词语义辨析。extinct意为“灭绝”，其他选项意思不对。根据题意，A为正确答案。

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