Over-cultivation and a long period of erosion has reduced the______of much of th

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问题 Over-cultivation and a long period of erosion has reduced the______of much of the country’s farmland.

选项 A、sufficiency
B、fertility
C、prosperity
D、mobility

答案 B

解析各项的意思是：sufficiency充足；fertility肥力；prosperity幸运，繁荣；mobility活动性，迁移率。根据句意判断，答案为B。

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