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           —What do you think we can do for our aged parents？
            
           —You　_____do anything except that you visit them as often as possible. 
            
           A. don’t have to  B. oughtn’t to  C. mustn’t  D. shouldn’t
          			
          


			
		
          
		
				
          
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           ----What do you know the _____ of are the pig influenza in humans?
            
             ---- usually similar to regular human seasonal influenza .
            
             A. symptoms          B.sympathy           C.symbol            D.symptom
          

			
          

			
          
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