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          -How amazing it is that astronauts are exploring outer space!  
          -It’s a challenge, I guess, _________man against nature.  
          A．ofB．forC．byD．a(chǎn)bout 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          應(yīng)答句中的I guess是插入語，因此所填介詞與challenge連用，表所屬，用of，選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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