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          Amazing     it is, an astronaut’s superior position is filled with potential danger.
          A．whenB．ifC．unlessD．a(chǎn)s
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：正如很令人驚奇一樣，一位宇航員高級的職位也充滿著潛在的危險。When當……時候；if如果；unless除非；as正如，選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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