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          There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails. 
          A．sinceB．ifC．a(chǎn)sD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
           D 
          句意：沒辦法知道為什么一個(gè)人有重大發(fā)現(xiàn)，而另外一個(gè)人雖然也很聰明，卻沒有（重大發(fā)現(xiàn)）。此處while是并列連詞，表示轉(zhuǎn)折和對(duì)比，意思是“然而”。根據(jù)句意選D。
          【考點(diǎn)定位】本題考查并列連詞的用法。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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