Though faced with so many difficulties, they are _____ about their future.

A. curious B. enthusiastic

C. optimistic D. concerned

C

【解析】

試題分析： 考查形容詞辨析。A. curious 好奇的；B. enthusiastic熱情的；C. optimistic樂觀的；D. concerned關(guān)心的；句意：雖然他們面對許多的困難，但他們對于未來還是很樂觀的。根據(jù)句意可知選C項(xiàng)。

考點(diǎn) : 考查形容詞辨析

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