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    【题目】For years，scientists have been worried about the ________ of air pollution on the earth's natural conditions. （ ）
    A.effect
    B.result
    C.account
    D.cause

    【答案】A
    【解析】A．effect影响；B．result结果；C．accountt叙述，账目；D．cause原因，事业；句意：许多年来，科学家们一直担心空气污染对地球的自然环境带来的影响。根据句意，故选A。.

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