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				 If you feel dizzy in a coal-burning room, that’s lack of  . Please open the window and air the room at once.   A. onion      B. hydrogen    C. oxygen     D. carbon-dioxide			【查看更多】
			


		
           
          


		
          
		
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          216. If you feel dizzy in a coal-burning room, that’s lack of    . Please open the window and air the room at once.
            
          A. onion__________    B. hydrogen__________       C. oxygen               D. carbon-dioxide
          

			
          
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          If you feel dizzy in a coal-burning room, that’s lack of　  . Please open the window and air the room at once.
            
          A. onion　　　　　 B. hydrogen　　　　 C. oxygen　　　　 D. carbon-dioxide
              
           
          

			
          
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