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

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

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

答案 B

解析上下文语义。根据语境，空格应填入与soil同类的词。选项中，只有fertility(肥沃；生产力)符合题意。故答案为B。sufficiency“充足，充裕”；prosperity“繁荣”；mobility“变动性；情感不定”。

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