【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】試題分析：A. Once 一旦 B. If 如果 C. Although 盡管 D. Because因為。句意：盡管鳥兒們用羽毛來飛翔，但是他們的一些羽毛還有其他用途。根據(jù)語境可知前后之間是讓步關(guān)系，故選C。

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