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导致扬沙、沙尘暴加剧的原因主要是 【 】
①过度放牧,羊群破坏草原(啃草原) ②采掘药材,导致草地破坏,黄土裸露 ③西伯利亚冷高压势力逐渐增强,风力逐年增大④世界气候越来越干,降雨量减少,蒸发量不断增大
A.①②
B.③④
C.②③
D.①④

A.①②
B.③④
C.②③
D.①④

【参考答案】

A
【解析】本题是对人地关系的考查.根据上题的资料,近年来,沙尘暴和扬沙天气渐趋严重的主要原因,是在内陆荒漠的边......

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