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          As civilization______, more and more people have realized the importance of preserving rare animals from extinction.
            
          A. stretches   B. spreads   C.extends   D. expands
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
             
          解析:
               
          spreads  “傳播，擴散”。A“伸展”；C“延長”；D“膨脹，擴大”。  
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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