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