题干

二十一世纪,人类面临的共同问题是(  )

A:水土流失、土地沙化

B:流行病的防治

C:资源的短缺

D:人口、资源、环境问题

上一题 下一题 0.0难度 选择题 更新时间:2018-01-21 02:42:35

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D

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