题目

（1） 下列几组物质中：①18O2和16O2 ② C和 C ③正丁烷和异丁烷 ④红磷和白磷 ⑤和 ⑥ 和 ⑦CH4和 属于同位素的是（填序号，下同）；属于同分异构体的是；属于同系物的是。 （2） 下列各物质：①He ②NH3 ③H2O2 ④CaO ⑤KOH⑥Na2O2 ⑦Al2O3 ⑧MgCl2中，只含共价键的是；既含离子键又含共价键的物质是。 （3） 下列变化过程：①碘的升华 ②NaCl固体溶于水 ③蔗糖溶于水 ④HCl气体溶于水⑤烧碱熔化 ⑥氯化铵受热分解，其中化学键没有被破坏的近期, 你所在城市的中学生就“最美汉字”进行投票。请阅读下面一则新闻报道, 用英文写一篇短文, 向学校英文报“Happy Teens”专栏投稿。 High school students recommend ren as message to the world The Chinese character ren, a word that generally means “benevolence”, has been selected by high school students in a poll(民意调查)to highlight Chinese culture around the world. The character ren was selected by 8.33 percent of the 3. 000 respondents who took part in the poll, according to one of the organizers, a student from a high school. It was followed by the characters ai, yi, meng and xiao, which mean ‘‘love”, “one”, “dream’’ and “filial piety”. Those characters ranked in the “top-20 most beautiful Chinese characters”. China Dally, March 6, 2013. Page 4 你的短文应包括以下内容： 1. 简要概括学生推荐这五个汉字的理由。 2. 简述你最想推荐的一至两个汉字及其寓意。 3. 谈谈你的感想。 注意： 1. 对所有要点逐一陈述, 适当发挥, 不要简单翻译。 2. 词数150左右。开头已经写好, 不计入总词数。 3. 作文中不得提及有关考生个人身份的任何信息, 如校名、人名等。 Recently, some high school students conducted a poll asking people to choose some Chinese characters that Can best reflect Chinese culture. _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _____________________________________________________________________