题目

— I had a pleasant trip last week.— ________A．Good idea.B．Congratulations!C．Thank you.D．I’m glad to hear that. 答案：【答案】D【解析】句意：——我上周旅行很愉快。——听到这个我很高兴。考查情景交际。Good idea.好主意。Congratulations!祝贺！Thank you.谢谢。I’m glad to hear that.听到这个我很高兴。根据“I had a pleasant trip last week.”可知，得知对方旅行很愉快，我很高兴。故选D。某饱和一元醛发生银镜反应可得21.6g银，将等量的该醛完全燃烧，生成7.2g水。此醛可能是（ ）A.甲醛B.乙醛C.丙醛D.丁醛