题目

下列图示是初中化学中常见的装置，请结合图示回答： （1） 请写出仪器a的名称． （2） 实验室用分解过氧化氢的方法制取氧气，应选择的发生装置是（填字母），收集装置是（填字母）；该反应的化学方程式是，反应中MnO2的作用是． （3） 实验室用大理石与稀盐酸制取二氧化碳的化学方程式是，用如图E验证二氧化碳是否集满，集满观察到的现象是．NO.4 Middle School Kunming, Yunnan April 2nd, 2004Dear editor（编辑）I live in a beautiful city. Many visitors come to my city. There are so many colorful peacocks(孔雀)here .The peacocks mostly live on the grass land of Dongfeng Square（广场）They are given food freely by visitors ,They usually throw food to them ,and  don’t think about at all whether the food is right or not. Some of the peacocks became ill, some even died after eating the bad food given by the visitors . I’m sure most of the visitors who throw food to the peacocks really like the birds ,but don’t realize(意识到)that they may be doing them harm (伤害).The visitors should be told that what have done is very harmful to the birds , and this kind of thing must be stopped from happening Perhaps we can build some small shops beside Dongfeng Square to sell peacock food .For us every person, it’s our duty to give more love to these beautiful birds and to look after them carefully.Yours, Sun Yan1.Many visitors come to the writer’s city to           A.do some shoppingB.see beautiful peacocksC.play on Dongfeng SquareD.eat nice food2.Some peacocks became ill and died because some visitors            A.didn’t give them any foodB.gave them too much foodC.threw them some bad foodD.loved them and played with them3.Some shops can be built beside Dongfeng Square so that they may            A.sell food for visitorsB.sell food for peacocksC.make the square more beautifulD.have the beautiful birds4.From the passage we know people should            A.live and play with the birdsB.stop the birds from eating too muchC.give right food to the birdsD.give more food to the birds5.We can guess the writer of the letter, Sun Yan ,may be a            A.visitorB.shopkeeperC.square keeperD.student