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          -- Is air the lightest thing in the world?
          -- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.
          A．nowB．yetC．thenD．a(chǎn)gain
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          now 現(xiàn)在，既然；yet但是，然而；then那么，然后；again又，再；句意：在世界上空氣是最輕的嗎？——現(xiàn)在不是了。來自浙江大學的科學家們已經(jīng)開發(fā)出了世界上最輕的材料了。結合語境可知選Ａ。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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