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                   of the surface of the earth          covered with water.
          A．Seven-tens...are B． Seven-tens…is
          C． Seven-tenths...isD．Seven-tenths...are
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：地球表面的十分之七被水覆蓋。分?jǐn)?shù)的基本形式為分子為基數(shù)詞，分母為序數(shù)詞，分?jǐn)?shù)視為一個(gè)整體，單數(shù)，故選C.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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