单选题

Turning cultivated land back into forests or pasture is a fundamental way to stem soil ______ and desertification in the long run.
A. erosion B. depletion C. violation D. delusion
【正确答案】 A
【答案解析】句意：从长远来看，退耕还林或退耕还牧是阻止沙漠侵害和沙漠化的基本途径。 erosion侵害，侵蚀；depletion损耗；violation违背，妨碍；delusion错觉。