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          ---How amazing it is that astronauts are exploring outer space!  
            
            ---t’s a challenge, I guess,         man against nature.  
            
          A. of             B. for               C. by              D. about
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
             
          解析:
               
          考查介詞。應答句中的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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