Over-cultivation and a long period of erosion has reduced the______of much of the country's farmland.
A、
sufficiency
B、
fertility
C、
prosperity
D、
mobility
【正确答案】
B
【答案解析】
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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