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    This also keeps the air，soil，water crops________ chemicals.

    A．out ofB．out fromC．free ofD．rid of

    C

    解析试题分析：固定搭配free of…免受…的伤害；句义：这个总是能够让空气，土壤和水生物免受化学物质的伤害。根据句义说明C正确。
    考点：考察介词固定搭配

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