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          Scientists are convinced    the positive effect of laughter   physical and mental health.
          A．of; atB．by; inC．of; onD．on; at
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C 
          be convinced of 確信。effect on……，有關(guān)于------方面的影響。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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