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Do you know a spaceship flies at about nineteen kilometers ________ second?
A.theB.aC./D.an
B
句意: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,选B。
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