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          Did you know the Earth is home to __________ animals?
          A．millionB．millionsC．millions ofD．million of
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考查數(shù)詞。句意為：你知道嗎地球是幾百萬動物的家園？million與數(shù)字連用時，表示確定的數(shù)目，要用單數(shù)形式；與of連用，表示不確定的數(shù)目，要用復(fù)數(shù)形式。所以要選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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