Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhou

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问题 Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhouse effect.

选项 A、recognized
B、proved
C、got rid of
D、multiplied

答案A

解析 recognize认可，承认；prove证明，检验；get rid of消除；multiply繁殖，增加；identify识别，鉴别。

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