据报载，我国江西省中南部山区出现大片红色荒漠，即在亚热带湿润

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据报载，我国江西省中南部山区出现大片“红色荒漠”，即在亚热带湿润的岩溶地区，土壤遭受严重侵蚀，基岩裸露，地表出现类似荒漠化景观的土地退化现象。据此，回答各题。
“红色荒漠”形成的自然原因主要是（）

A．风化作用	B．风蚀作用
C．水蚀作用	D．沉积作用

“红色荒漠”形成的人为原因主要是（）

A．滥伐森林	B．过度放牧
C．开山取石	D．环境污染

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