题目内容

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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