I don't think it's sensible of you to _____ your greater knowledge in front of the president, for it may well offend him.

【正确答案】 C

【答案解析】解析：考查动词短语辨析。shows up“揭露，露面”；shows around“带领……到处看看”；show off“炫耀”；show out“送出(客人)”。根据形容词not…sensible(不明智的)，可以划断答案为show off，即C。