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          It is said that the gravity on Mars is only about __________ of the gravity on earth．
          A．three-eighthsB．third-eighthC．three-eighthD．third-eighths
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：據(jù)說火星上的重力是地球上重力的八分之三。分?jǐn)?shù)的表達(dá)為分子用基數(shù)詞，分母用序數(shù)詞，當(dāng)分子大于一時，分母的序數(shù)詞用復(fù)數(shù)形式；故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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