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          There are so many foggy days these days. We all wonder                   .
          A. how is the air polluted          
          B. why the air is polluted seriously
          C. what are the real reasons
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：---這些日子有許多霧天。我們都想知道為什么空氣被污染的這么嚴(yán)重。根據(jù)句子意思，故選B.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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