11．To me，cycling at _____ altitudeof more than 4，000meters was _____ unforgettable experience．（　　）
A．the； anB．an； anC．/； aD．an；/

分析 對我來說，在海拔四千多米的地方騎車是一次難忘的經(jīng)歷．

解答 答案：B
題干中altitude高度，表示的是泛指，要用不定冠詞；experience表示經(jīng)歷，類指一種，要用不定冠詞．故選B．

點評 冠詞是一種虛詞，本身不能獨立使用，只能放在名詞前幫助說明名詞所指的人或事物，它是英語詞性中最小的一類，只有三個，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場合不用冠詞，即通常所稱的零冠詞．不定冠詞表示泛指，定冠詞表示特指．

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