His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.

A. technical B. official

C. educated D. enthusiastic

D

【解析】試題分析：考查形容詞辨析。A技術(shù)的；B官方的，法定的，公職的，正式的；C有教育的，受過良好訓(xùn)練的；D熱心的，熱情的。句意：朋友們熱情鼓勵(lì)他發(fā)表自己的觀點(diǎn)，但哥白尼很謹(jǐn)慎。故選D。

考點(diǎn)：考查形容詞辨析

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