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          .A ________may be given ____means of flags, lights, and guns.
          A．sign; byB．signal; inC．signal; byD．sign; in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考查詞義辨析。sign 符號(hào)，signal 信號(hào)，短語：by means of 以什么樣的方式，句意：信號(hào)可以以紅旗，燈光和發(fā)槍的形式給出。所以選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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