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          In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes. 
            
          A．the; the B．a(chǎn); ∕    C．∕; a    D．the; a
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
             
          解析:
               
          in preparation for 固定搭配；a knowledge of 某一門(mén)知識(shí)，這個(gè)時(shí)候可數(shù)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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