题目

某同学不小心把硫酸铜溶液滴加到盛有5%双氧水的溶液中，发现立即有大量气泡产生。该同学想知道硫酸铜溶液中的哪种粒子能使双氧水分解的速度加快，设计并完成了以下三个实验，请回答有关问题。 （1） 依据所学知识，该同学认为硫酸铜溶液中含有的粒子有(写化学符号)。 （2） 实验②中加入稀硫酸的目的是。 （3） 如果实验②中无现象，实验①③中产生大量的气泡，则说明。此题要求改正所给短文中的错误.对标题号的每一行做出判断：如无错误，在该行右边的横线上划（√）；如有错误（每行只有一个错误），则按下列情况改正： 此行多一个词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。 此行缺一个词：在缺词处加一个漏字符号（^），在该行右边横线上写出该加的词。 此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。 注意：原行没有错的不要改。 When father bought me a computer for a birthday present                                    1．      in last year, I felt very excited. As we all know, computers                                    2．      are getting more usefully nowadays. Much information                                         3．      can be stored in it. We can learn what has lately happened                                     4．      in the world on the Internet. People had to do lots of work                                    5．       which was very danger. Now, computers can do it instead.                                 6．      When an exam is come, I do exercises on my computer.                                      7．      Then it will correct them but tell me the right answers.                                         8．      It is convenient for me to prepare for the exam than                                              84．      before. The computer have become a real friend of mine.   85．