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          _Stressful environments lead to unhealthy behaviors such as poor eating habits,which_______increase the risk of heart disease.
          A．in turnB．in return
          C．by chanceD．by turns
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查介詞。介詞短語in turn的意思是“依次，反過來”，符合語境；in return的意思是“作為……的回報”，by chance“偶然”；by turns “輪流地，逐個地”。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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