题目

现有三组混合液：①乙酸乙酯和乙酸钠溶液  ②乙醇和丁醇  ③溴化钠和单质溴的水溶液，分离以上各混合液的正确方法依次是（    ）A.分液、萃取、蒸馏                      B.萃取、蒸馏、分液C.分液、蒸馏、萃取                      D.蒸馏、萃取、分液 答案：解析：①组明显分层，上层为酯，下层为盐溶液可用分液分离，②组沸点不同，互溶的液体只能用蒸馏方法，③组用有机溶剂将混合液中的Br2萃取出来.答案：C短文改错（满分10分）I have a good friend — a smart cat. He enjoys playing with me, that brings much happiness to me.One evening, I noticed that my cat stopped playing. I looked up, and here, about three meters ahead of my cat, was a big mouse. It seems to be eating something, their little eyes turning to look around from time to time.I held my breath and felt a bit exciting. I couldn’t help wondering whether my cat was able to catch so big mouse. Suddenly, he jumped at the mouse with his mouth widely open. The mouse tried to escape, and it was too late. The poor mouse was killed before it realized that what had happened. Then my cat held the mouse between his tooth and brought it over to me as if to say he had done a good job.