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