读下图回答图中圆内裸地表示沙层裸露或固定沙丘活化导致这种现象的原因是a 过度樵采 b 过度开垦 c 过度放牧 d 过度砍伐——青夏 Template




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tomski读下图回答图中圆内裸地表示沙层裸露或固定沙丘活化导致这种现象的原因是a 过度樵采 b coloring