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

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

【答案】B

【解析】

考查介词短语词义辨析。句意:青霉素是被偶然发现的,它的发现超出了研究者的预期。选项A译为“故意地”;B译为“偶然的、意外的”;C译为“有时、偶尔”;D译为“错误地”。根据“which went well beyond the researchers’ expectations.”可知,青霉素是被偶然发现的。故选B项。

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