【单选题】
Recent studies have identified four major global environmental risks: acid rain, ozone depletion, deforestation and the greenhouse effect.
A.recognized
B.proved
C.got rid of
D.multiplied
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根据网考网移动考试中心的统计,该试题:
70%的考友选择了A选项
22%的考友选择了B选项
5%的考友选择了C选项
3%的考友选择了D选项