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    31．Scientist are not sure about the of water on the Mars. A．occupation B．existence C．demand D．treasure 【查看更多】

     

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    Scientist are not sure about the ___________ of water on the Mars.

       A．occupation   B．existence  C．demand D．treasure

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    Scientist are not sure about the ________ of water on the Mars．

    [　　]

    A．occupation

    B．existence

    C．demand

    D．treasure

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