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          Green plants breathe_____oxygen in sunlight.
          A．inB．outC．backD．for
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查介詞用法。句意：在陽光下，綠色植物釋放出氧氣。此處釋放的意思；breathe out意思“排出氣體”，符合句意。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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