It is estimated that, currently, about 50,000 species become______every year.

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问题 It is estimated that, currently, about 50,000 species become______every year.

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

答案A

解析 extinct意为“灭绝的,绝种的”;instinct意为“清晰的;明显的”;instinct意为“本能”;intense意为“强烈的,剧烈的”。
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