【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】

句意：雖然鳥使用他們的羽毛飛行，他們的羽毛還有其他的用途。Once一旦；曾經(jīng)；If如果，引導條件狀語從句；Although盡管，雖然，引導讓步狀語從句；Because因為，引導原因狀語從句。根據(jù)句意可知，前后兩句話之間是轉(zhuǎn)折的關系，故應選C。

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