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          It's our duty to              people           too many trees．
            
          A．stop；cutting down                                 B．prevent；to cut down
            
          C．keep；cutting down                                   D．make；cut down
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、A
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          It's our duty to              people           too many trees．
            
          A．stop；cutting down                                 B．prevent；to cut down
            
          C．keep；cutting down                                   D．make；cut down
          

			
          
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