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				 While flying, a  bat makes a sound which hits things and comes back  to its ears. In this way it’s able to know        the things are and avoid  bumping into them.A. how        B.  where       C. what      D. which			【查看更多】
			


		
     
    


		
    
		
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    While flying，a bat（蝙蝠）makes a sound which hits things and comes back to its ears．In this way it's able to know           the things are and avoid bumping into them．
      
    A．how                    B．where                  C．what                      D．which
    

			
    
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