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

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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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