This also keeps the air，soil，water crops________ chemicals.
A．out ofB．out fromC．free ofD．rid of
C

試題分析：固定搭配free of…免受…的傷害；句義：這個總是能夠讓空氣，土壤和水生物免受化學物質(zhì)的傷害。根據(jù)句義說明C正確。
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