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    【题目】 ______ birds use their feathers for flight, some of their feathers are for other purposes.
    A.Once
    B.If
    C.Although
    D.Because

    【答案】C
    【解析】虽然鸟类用羽毛飞行，但它们的一些羽毛是为了其他用途．once"一旦"，引导条件状语从句．if"如果"，引导条件状语从句．although"尽管，虽然"，引导让步状语从句．because"因为"，引导原因状语从句．分析可知前后两句话之间是逻辑上的"让步"关系，再结合句子所表达的意思可知答案选C．

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