题目

A. long B. bike C. easily D. movies E. places F. car G. shopping H. pay I. along J. but K. and L. enjoy Hello, I’m Mike. I live in a small but beautiful neighborhood (社区). People here are always friendly. In our neighborhood people usually go out by 【1】, so there isn’t a traffic jam (交通阻塞). People can go to work or school on time. And the air here is very clean. Our neighborhood has a 【2】 pedestrian street (步行街). Many shops are on it. People like to walk 【3】 it and spend time there. Of course, 【4】is very easy on this street. You can buy all kinds of things如下图所示装置可用来制取和观察Fe（OH）2在空气中被氧化时的颜色变化，实验时必须用铁屑和6mol?L-1的硫酸，其他试剂任选。填写下列空白。         （1）装置B中盛有一定量的NaOH溶液，装置A中应预先加入的试剂是___________，装置A中反应的离子方程式是_____________________________。（2）实验开始时应先将活塞E______（填“打开”或“关闭”），C中收集到气体的主要成分是___________。（3）简述生成Fe（OH）2的操作过程_________________________________________________________。（4）拔去装置B中的橡胶塞，使空气进入，写出有关反应的化学方程式：_________________________。