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    Oxygen usually in the form of gas in nature but when made cold enough, it can also take the form of solid. A. remains B. stays B. exists D. survives 【查看更多】

     

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    Oxygen usually ______ in the form of gas in nature but when made cold enough, it can also take
    the form of solid.    
    [     ]

    A. remains    
    B. stays    
    B. exists  
    D. survives 

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    Oxygen usually ______ in the form of gas in nature but when made cold enough, it can also take the form of solid.

    　 A. remains　 　　　B. stays　　 　　　　 B. exists　 　　　　　D. survives

     

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