摘要： 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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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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