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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