This new kind of chemicals will help keep the air，soil and water

This new kind of chemicals will help keep the air，soil and water________ from pollution.
A、free
B、empty
C、loose
D、short
【正确答案】：A
【题目解析】：free 自由的；empty 空的；loose 宽松的；short 短的；句意：这种新的化学物质将有助于保持空气、土壤和水不受污染。 free from使免于；固定搭配，因此A 符合题意。