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          Nowadays scientists are working hard to find out ______ to do with air pollution.
          A．howB．whyC．whenD．what
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：現(xiàn)在科學(xué)家們正在努力找出做什么可以解決空氣污染問題。how 怎么； why為什么； when何時； what什么。所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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