题目内容

Jumping out of ___ airplane at a height of 5000 kilometers is ___ unforgettable experience.           
A．an ; aB．an ; anC．an ; /D．a ; an
B

试题分析：考查冠词用法。修饰可数名词用不定冠词a/an；这里的“一架飞机”是泛指，airplane首字母发音是元音，故用an，排除D；experience指“经历”时，是可数名词，unforgettable首字母发音是元音，用an修饰，排除A、C，故选B。
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