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Do you know a spaceship flies at about n...

Do you know a spaceship flies at about nineteen kilometers ________ second?

A. the    B. a     C. /    D. an

 

B 【解析】 试题分析:你知道宇宙飞船以每秒十九千米的速度飞行吗?结合语境可知本句中泛指任何一秒,故用不定冠词。second词首音素是辅音,故不定冠词用a,答案选B。 考点:考查冠词的用法。  
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