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          As is known to us all, the Sahara Desert is a natural _____ between north and central Africa. 

          A. barrier 
          B. routine 
          C. garment 
          D. basis 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				A				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
			請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
					
					
			
          
			
          
			
          
		
          
	
          
		
		
          
			
          
			
			
		
          



							
          
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          As is known to us all, the Sahara Desert is a natural _________ between north and central Africa．

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          As is known to us all, the Sahara Desert is a natural _________ between north and central Africa．
          

          

          [　　]
          

          A．

          barrier
          

          

          B．

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          C．

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          D．

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