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				7．On the 40th  Earth Day.Dr Wang gave  us a talk on the importance of          the earth．A．practicing     B．preventing     C．polluting       D．protecting			【查看更多】
			


		
     
    


		
    
		
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    On the 40th Earth Day，Dr Wang gave us a talk on the importance of ________ the earth．
      
    A．practicing          B．preventing          C．polluting           D．protecting
    

			
    
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