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Farmers here _________keeping the soil rich and _________diseases.
A.focus on…free ofB.center … free from
C.attend on… free ofD.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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