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          Scientists think that there has been life on Earth for _______ years.       
          A. millions     
          		 B. millions of
          		C. million of
          		D. million
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：此題重點(diǎn)考查數(shù)詞的表達(dá)法，如果有確切的數(shù)字 thousand 或million后面直接跟名詞，thousand 和million等不用復(fù)數(shù)，也不用of，而thousands of，millions of直接跟名詞或代詞,前面不用確切的數(shù)字表示約數(shù)，根據(jù)題意故選B
          點(diǎn)評(píng)：正確區(qū)分是確切數(shù)還是不確切數(shù)，二者不能混淆，關(guān)鍵是thousand和million加不加s。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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