【题目】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。错误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。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
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。
Decades ago there was no such a thin-communication. On September 7th 1987, the global system for mobile communication or GSM were born. And international agreements that laid off the standards and regulation gave rise to a global mobile phone industry.
To be honest, the world’s first mobiles were not so attractive but the range of effectiveness wasn’t very well. But they became a must-have among those wealth people could afford one. However, by taking advantage of GSM which has many different elements, we could all enjoy the ability to go around the world in 217 countries, land in any of it and know a phone will work.
在线课程【答案】
【解析】这篇文章介绍了手机的发展史。
考查冠词。Communication是不可数名词，所以删除a。
考查主谓一致。the global system for mobile communication or GSM是单数意义，所以were改成was。
考查固定短语。表示“安排标准和规则的国际协议”lay out安排，是固定用法，所以off改成out。
考查名词单复数。and连接并列结构，and之前是名词复数，and之后也要用名词复数，所以regulation改成regulations。
考查连词。the world’s first mobiles were not so attractive 与 the range of effectiveness wasn’t very well.之间是并列关系，所以but改成and。
考查形容词。这里表示“实效范围也不好”，well表示身体健康的，所以well改成good。
考查形容词。修饰名词people，用形容词，所以wealth改成wealthy。
考查定语从句。who could afford one.是一个定语从句，修饰先行词wealth people，关系词在从句中作主语，指人，所以could前加who或者that。
考查时态。表示经常反复发生的事情，用一般现在时，所以could改成can。
考查代词。指代前面的217 countries，是复数意义，所以it改成them。