题目内容

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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