题目

实验室制乙烯的反应为：  制取过程中，温度需迅速升到170 ℃，为何？________________。但也常因温度过高而使乙醇和浓H2SO4反应生成少量SO2。有人设计下列实验以确认上述混合气中有乙烯和SO2。（1）各装置盛放的试剂是：Ⅰ.__________，Ⅱ.__________，Ⅲ.__________，Ⅳ.__________。（将有关试剂的序号填在横线上）A.品红          B. NaOH              C.浓H2SO4              D.KMnO4酸性溶液（2）能说明SO2气体存在的现象是__________。（3）使用装置Ⅱ完形填空,阅读下面短文，掌握其大意，然后从每题所给的A、B、C、D四个选项中选出最佳选项。“Mommy, I got something for you!” Cody ran the door after school. His face wore the biggest smile ever. He waved something above his head. “It’s a pen. But not any pen. It’s a lucky pen!” He handed me the pen , waiting for my reply.I looked at the pen in my hand. There was special about it. It looked just like any other pen in my drawer. At that moment, I didn’t realize how special it was or I would treasure(珍爱) it.I had made the decision to be a writer, but I was afraid of being by the publishers（出版社）. The night before, I told my husband my when I didn’t think Cody was listening. “What if nobody likes my writing and I fail?” But Cody did what I said. Now he stood in front of me, watching me examine the pen. “You don’t have to be afraid now,” he said. “This pen will make your great and everyone will love them.”Tears filled my eyes. Even if I sold the first book, I had everything I could ever need. And I felt already, just by having Cody in my life, especially when I heard what he did to get it. At lunch, Cody heard an older boy talking about having a lucky pen. He decided to get it for me. The boy wouldn’t agree but Cody didn’t . Finally, he traded his favorite model car and two army men--his mos important things for that pen. Just to make feel better.I still have that pen, it’s long out of ink（墨水）, in a cup on my desk. When a refusal letter arrives and I start feeling , I look at it and remember just how lucky I am. So I value（重视） that pen, it’s Cody who I treasure really in my life.【1】A. across B. through C. past D. over【2】A. just B. quite C. exactly D. mainly【3】A. easily B. secretly C. proudly D. naturally【4】A. something B. nothing C. anything D. everything【5】A. how often B. how many C. how much D. how long【6】A. checked B. chosen C. enjoyed D. refused【7】A. fear B. hope C. sadness D. surprise【8】A. hear B. accept C. expect D. believe【9】A. life B. dream C. stories D. programs【10】A. ever B. even C. never D. once【11】A. comfortable B. lucky C. brave D. proud【12】A. give back B. give out C. give away D. give up【13】A. them B. us C. me D. her【14】A. since B. while C. because D. though【15】A. nervous B. sorry C. angry D. Lonely