题目

下列除去物质中杂质（括号内为杂质）的方法， 正确 的是 选项物质（杂质）除杂方法AFe（ Cu ） 向物质中加入足量的稀盐酸，充分反应后过滤，洗涤，烘干BKCl（ MnO 2 ）将物质加水溶解，过滤，洗涤，烘干CCO2 （CO ） 将该混合气体在氧气中点燃DNaCl（ CaCl 2 ）将物质溶于水，然后向溶液中加入过量的碳酸钠溶液，过滤，再向滤液中加入过量的稀盐酸，充分反应后蒸发结晶 A． A B． B C． C D． D短文改错(共10小题;每小题1分，满分10分)假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。增加:在缺词处加一个漏字符号(∧) ,并在其下面写出该加的词。删除:把多余的词用斜线(\) 划掉。注意：1. 每处错误及其修改均仅限一词；    2. 只允许修改10处，多者(从第11处起) 不计分。   I still remember that night after my senior high school entrance examination. Even though I was at the top of my class,I was not good in history. At around 10 pm,I tried to sleep,and my eyes just wouldn't close. Suddenly,I saw my dad coming into my room,with smile on his face,asked me to go to sleep. I told him that I couldn't get to sleep. He called me into my room and put his hand on my head. I didn't even realize that I had fallen asleep. I took up my exam the next day and the result was satisfied. It's tough to put into word what parents do for us but times like this reminds me just how wonderful parents truly are.