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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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