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    Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.

    A．frequently B．significantly C．steadily D．consequently

    D

    解析试题分析：考查副词辨析。A频繁地；B有重要意义，显著地；C稳定地；D因此。句意：化学污染将给农业和食物链带来威胁，自然而然也会威胁到人类。故选D。
    考点：考查副词辨析

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