【題目】【2013蘭州】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：句意：你知道宇宙飛船以每秒十九千米的速度飛行嗎？結(jié)合語(yǔ)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，選B。

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