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          --- Do you know the reason _________ pilots turn off the plane’s lights before taking off? 
            
              ---The practice is for the passengers to adjust to the dark _________ an emergency.
            
           A. why; for fear that                    B. for which; in case of           
            
           C. how; for fear of                      D. that; in case
          			
          


			
		
          
		
				
          
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           A．live with     B．go through      C．die from  D．live through
          

			
          

			
          
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