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    In this solar system, only the Earth satisfies the complex conditions for physical life as we know it. A. necessary B. are necessary C. that is necessary D. is it necessary 【查看更多】

     

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    In this solar system, only the earth satisfies the complex conditions ________ for physical life as we know．


    1. A.
      necessary
    2. B.
      are necessary
    3. C.
      that is necessary
    4. D.
      it is necessary

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    In this solar system, only the earth satisfies the complex conditions ________ for physical life as we know．

    [　　]

    A．necessary

    B．are necessary

    C．that is necessary

    D．it is necessary

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