His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.
A．technicalB．officialC．educatedD．enthusiastic
D

試題分析： 考查形容詞辨析A有技術(shù)的B官方的C 教育的D熱情的。根據(jù)題意 他的朋友很是熱情，鼓勵(lì)他去表達(dá)他的想法，但是哥白尼很謹(jǐn)慎。故選 D項(xiàng)。
考點(diǎn) 形容詞辨析
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