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           It is already well understood        causes the global warming.
          A．whatB．whenC．thatD．how
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A               
                       
          試題分析：考查連詞。句意 這讓我們很好的了解， 什么導(dǎo)致了全球變暖。It做形式主語，真正的主語是后面的主語從句      causes the global warming ，主語從句缺少主語用what“什么”引導(dǎo)， 所以選A項(xiàng)。       
          考點(diǎn) : 考查連詞
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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