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    Oxygen usually in the form of gas in nature but when made cold闂傚倸鍊搁崐鐑芥嚄閸洖纾婚柕濞炬櫅绾惧灝鈹戦悩宕囶暡闁搞倕鐗忛幉鎼佹偋閸繄鐟ㄩ梺缁樺笒閻忔岸濡甸崟顖氱闁规惌鍨遍弫楣冩煟鎼淬垻鍟查柟鍑ゆ嫹【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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