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          Do you know a spaceship flies at about nineteen kilometers ________ second?
          A．theB．a(chǎn)C．/D．a(chǎn)n
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          句意：你知道宇宙飛船以每秒十九千米的速度飛行嗎？結(jié)合語(yǔ)境可知本句中泛指任何一秒，故用不定冠詞。Second詞首音素是輔音，故不定冠詞用a，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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