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

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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