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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 【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 properly in        space.

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

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