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           13. All substances, _____ solid, liquids or gases, are made up of entirely atoms.
            
           A. whether they         B. whether
            
           C. whether are they     D. whether are
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
             
          解析:
               
          選B。本題考查省略用法。 whether (they are) solid, liquids or gases。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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