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          Newton was playing under an apple tree _____an apple fell onto his head.
            
          A．when            B．while              C．after              D．before
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、A
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Newton was playing under an apple tree ________ an apple fell onto his head．
          

          

          [　　]
          

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