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          About seventy percent of the earth         with water.
          A．is coveringB．is covered C．are coveringD．are covered
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：地球大約70%的部分被水覆蓋著。the earth做主語為不可數(shù)名詞，所以謂語動詞用單數(shù)形式，地球與水覆蓋應該是動賓關系，所以用被動語態(tài)；故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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