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    3．H1N1 control and prevention is a to Mexico as well as the whole world. A．surprise B．challenge C．reaction D．threat 【查看更多】

     

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    H1N1 control and prevention is a        to Mexico as well as the whole world.

    A．surprise         B．challenge          C．reaction          D．threat

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    H1N1 control and prevention is a ________ to Mexico as well as the whole world．

    [　　]

    A．surprise

    B．challenge

    C．reaction

    D．threat

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