题目

对下表中所列待测物质的检测，所选用的试剂及预期结果都正确的是（ ） 待测物质检测试剂预期显色结果①DNA吡罗红红色②脂肪苏丹Ⅲ橘黄色③蔗糖斐林试剂砖红色④蛋白质双缩脲试剂紫色 A. ①③ B. ②③ C. ②④ D. ①④ 答案：【答案】C【解析】考点是生物组织中有机物的鉴定，主要是记忆水平的考查，属于基础题。DNA和甲基绿亲和，被染成绿色，①错误。脂肪可以被苏丹Ⅲ染成橘黄色，②正确。蔗糖不是还原性糖，不能用斐林试剂鉴定，③错误。 蛋白质和双缩脲试剂产生紫色反应，④正确。选C信息归纳（本题共5小题，每小题1分，共5分）请阅读下面这篇文章，根据所提供的信息，完成下面表格，把答案写在答题卡指定的位置上。Traveling to all corners of the world gets easier and easier. We live in a global village, but this doesn’t mean that we all behave in the same way.How should you behave when you meet someone for the first time? An American shakes your hand firmly while looking at you straight in the eye. In Thailand, people greet each other by pressing both hands together at the chestMany countries have rules about what you should and shouldn’t wear. In Muslim countries, women should wear long blouses and skirts. In Korea, you should take off your shoes when entering a house. Remember to place them neatly together where you came in.In Spain, many people eat a light breakfast and late dinner. In Mexico, lunch is the time to relax, and many people prefer not to discuss business as they eat. In Britain, it’s not unusual to have a business meeting over breakfast.Good MannersAspectCountryCustomGreetingAmericaShaking hands firmlyThailand1.Greeting each other by ________________________DressingMuslim countries2.Women wearing _______________Korea3.Taking off your _________ at the doorEatingSpain4.Eating _________________________MexicoRelaxing while having lunchBritain5. Having ___________ over breakfast