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          In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
          A．whetherB．untilC．ifD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析:句意：面對嚴(yán)重的事故，如果我們懂得一些基本的急救知識，我們就可以挽救生命。A是否，即使；B直到；C如果；D除非。根據(jù)句意可知前句是后句的假設(shè)條件，故答案選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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