【題目】Penicillin was discovered ____, which went well beyond the researchers’ expectations.

A.on purposeB.by accidentC.on occasionD.by mistake

【答案】B

【解析】

考查介詞短語詞義辨析。句意：青霉素是被偶然發(fā)現(xiàn)的，它的發(fā)現(xiàn)超出了研究者的預(yù)期。選項(xiàng)A譯為“故意地”；B譯為“偶然的、意外的”；C譯為“有時(shí)、偶爾”；D譯為“錯(cuò)誤地”。根據(jù)“which went well beyond the researchers’ expectations.”可知，青霉素是被偶然發(fā)現(xiàn)的。故選B項(xiàng)。

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