To me, cycling at ___ altitude of more than 4,000 meters was _____ unforgettable experience


  1. A.
    the; an
  2. B.
    an; an
  3. C.
    /; a
  4. D.
    an; /
B
：考查冠詞。第一空用an泛指在海拔超過4000米的地方。第二空指一次令人難忘的經(jīng)歷，unforgettable是以元音開始的，故用an.句意：對(duì)我來說，在海拔4000多米的地方騎自行車是一次令人難忘的經(jīng)歷。故B正確。
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