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Jumping out of ___ airplane at a height of 5000 kilometers is ___ unforgettable experience.           

A．a(chǎn)n ; aB．a(chǎn)n ; anC．a(chǎn)n ; /D．a(chǎn) ; an

B

解析試題分析：考查冠詞用法。修飾可數(shù)名詞用不定冠詞a/an；這里的“一架飛機”是泛指，airplane首字母發(fā)音是元音，故用an，排除D；experience指“經(jīng)歷”時，是可數(shù)名詞，unforgettable首字母發(fā)音是元音，用an修飾，排除A、C，故選B。
考點：考查冠詞用法

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