Do you know a spaceship flies at about nineteen kilometers second ?A.theB.a
题型:不详难度:来源:
Do you know a spaceship flies at about nineteen kilometers second ? |
答案
B |
解析
试题分析:句意:你知道吗宇宙飞船飞行速度是每秒大约19千米?不定冠词用在事物的"单位"前,如时间、 速度、价格等意义的名词之前,表示 "每一";元音因素前用a,辅音因素前用an.故选B。 |
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