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Farmers here _________keeping the soil rich and _________diseases.


  1. A.
    focus on…free of
  2. B.
    center … free from
  3. C.
    attend on… free of
  4. D.
    depend on… free from
A
这题考查词组辨析:focus on专注于,attend on照料depend on依赖,free of 和free from,免于,没有,句意是:这里的农民专注于保存土壤肥沃并免除疾病。选A。
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