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          _______ there are many different types of food, some animals spend their lives eating only one type.
          A．SinceB．UnlessC．OnceD．While
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析： A. Since 自從，既然，B. Unless除非，C. Once 一旦，曾經(jīng)，D. While 雖然，然而，當…時候，句意：雖然魚很多種不同的食物，但是一些動物一生只吃一種食物。表示轉(zhuǎn)折關(guān)系，所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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