题干

有下列物质:①乙醇②苯酚③乙醛④丙烯酸(CH2=CH—COOH)⑤乙酸乙酯,其中与溴水、酸性KMnO4溶液、NaHCO3溶液都能反应的是

A:仅①③

B:仅②⑤

C:仅④

D:仅③④

上一题 下一题 0.0难度 选择题 更新时间:2014-08-14 05:48:37

答案(点此获取答案解析)

C

同类题2

阅读下列材料:

材料一   (关于朝鲜战争的起因)不应纠缠于谁打响了朝鲜战争“第一枪”这一表面问题,而应将目光集中在一个更重要的问题上,这就是:朝鲜人民军在1950年6月25日大举越过三八线这一军事行动,得以实现的条件和前提是什么?在这个问题的指导下,朝鲜战争起因的研究很自然地就成为朝鲜战争前后国际关系的研究。……朝鲜战争最深刻的起因在于战后形成的美苏两个超级大国及其所控制的两大阵营之间的冷战格局,这种格局在朝鲜半岛就表现为围绕“三八线”展开的美苏两国外交争斗和南北朝鲜的军事对峙。“朝鲜南北双方都有意通过武力将自己的理想、权力和制度扩展到整个朝鲜半岛从而实现民族的统一。”

——沈志华《抗美援朝战争决策中的苏联因素》

材料二   关于朝鲜战争的结局,主要有三种看法:有人认为胜利属于中朝一方,也有人认为双方在战场上打了个平局,还有人认为美韩一方取得了胜利。这三种观点,虽然结论不同,但是在对战争胜负进行判定时,却大多采用同一种方法,就是以某种“数量分析”来计算胜负。于是对朝鲜战争胜负的争论,就变成了诸如战争双方谁死伤的人多、谁消耗的资源多等问题的争论。应该说,以“数量分析”计算战争胜负的方法,在一定情况下的确是有意义的。但“数量分析”有其一定的适用范围,不能滥用,否则就会得出歪曲历史的结论。判断胜负的主要标准应该是战争双方战争目的的达成情况。

——杨宁一《历史学习新视野新知识》

同类题3

阅读理解

    What did you do on April 23, World Book Day, last year? Did you find some interesting books to read? Now let me introduce some good books for you to read.

Title: Dear Andreas
Author: Long Yingtai&Andreas

Andreas is a college student studying in Germany. His mother is a writer working in Taiwan. By writing letters to each other for more than three years, Long Yingtai says she clearly understands what an 18-year-old man is like, Andreas says he knows his mother better. This is a great book full of love. Don't miss it.
Title: Climate Change+2 Degrees
Author: Yamamoto Ryoichi

If the earth's temperature went up 2℃, what would happen? In this book we learn about the history, today's situation and the future of global warming. The author also tells us proper and useful ways to protect our world.
Title: The Methods and Madness Inside Room 56
Author: Rafe Esquith

Perhaps the most famous fifth-grade teacher in America, Rafe Esquith, helps his children understand literature, love life, and become happy, self-confident people using his successful methods in his Los Angeles public school classroom. He has created surprising miracles. This is a powerful book. You'd better read it.
Title: The Last Lecture
Author: Randy Pausch

Randy Pausch, a professor from New York was asked to give a lecture. He knew it would probably be his last lecture, because he was dying of illness. His lecture wasn't about dying, but about getting over the difficulties, helping others to realize their dreams.