Soil_____is a natural process. It becomes a problem when human activity causes i

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问题 Soil_____is a natural process. It becomes a problem when human activity causes it to occur much faster than under natural conditions.

选项 A、preservation
B、abrasion
C、erosion
D、eruption

答案 C

解析各项的意思是：preservation“维护，保护”；abrasion“磨损处，擦伤处”；erosion“(水，风等的)侵蚀，腐蚀”；eruption“爆发，喷发”；erupt into laughter“突然大笑”。

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