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    The most common thing to do on the earth can be a big threat if properly, according to Chen Shanguang, designer of the spaceship. A. doesn’t handle B. not handled C. not handling D. having not handled 【查看更多】

     

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    The most common thing to do on earth, such as walking and eating, can be ________ big threat if not handled(处理)properly in ________ space．


    1. A.
      a;/
    2. B.
      /;/
    3. C.
      a; the
    4. D.
      /; the

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    The most common thing to do on earth，such as walking and eating，can be       big threat if not handled properly in        space.

       A．a；不填          B．不填；不填       C．a；the          D．不填；the

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    The most common thing to do on earth, such as walking and eating, can be ________ big threat if not handled(处理)properly in ________ space．

    [　　]

    A．a;/

    B．/;/

    C．a; the

    D．/; the

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