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           Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
          A．beforeB．a(chǎn)s
          C．unlessD．in case
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          C 考察連詞。Before在…之前；as因為，由于；unless除非，如果不；in case萬一，假使；句義：科學(xué)家警告說如果碳排放不下降，我們會面臨環(huán)境災(zāi)難。根據(jù)句義和邏輯關(guān)系可知C正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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