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我国目前已经成为世界上受荒漠化危害最严重的国家之一，造成我国荒漠化曰益严重的人为因素是 【 】
①缺水区用水不当，河道干涸 ②风蚀、水蚀和沼泽化 ③过度垦殖和过度放牧 ④常年在副热带高气压带控制下
A．①④
B．①③④
C．①③
D．③④

A.①④
B.①③④
C.①③
D.③④

【参考答案】

C
【解析】当前我国沙漠化日益严重，这与人类活动有密切关系，其主要人为因素有过度垦殖和过度放牧．植被遭到严重破坏......

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