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

A. the B. a C. / D. an

【答案】B

【解析】

試題分析:你知道宇宙飛船以每秒十九千米的速度飛行嗎?結(jié)合語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,答案選B。

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