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Do you know a spaceship flies at about nineteen kilometers      second ?
A.theB.aC./D.an
B

试题分析:句意:你知道吗宇宙飞船飞行速度是每秒大约19千米?不定冠词用在事物的"单位"前,如时间、 速度、价格等意义的名词之前,表示 "每一";元音因素前用a,辅音因素前用an.故选B。 
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