【題目】 ______ 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】雖然鳥類用羽毛飛行，但它們的一些羽毛是為了其他用途．once"一旦"，引導(dǎo)條件狀語從句．if"如果"，引導(dǎo)條件狀語從句．a(chǎn)lthough"盡管，雖然"，引導(dǎo)讓步狀語從句．because"因為"，引導(dǎo)原因狀語從句．分析可知前后兩句話之間是邏輯上的"讓步"關(guān)系，再結(jié)合句子所表達的意思可知答案選C．

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