划分施工段的目的是为了适应（）的需要。
A.流水施工
B.工程进度
C.工程质量
D.安全生产
参考答案：A
Organic food is produced from crops _____ chemicals, pests and so on. In one word, it is free from
pollution of any kind. [ ]
A. that is free from
B. free of
C. free with
D. which are free of
B. free of