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。
Welcome to the Great Wall. Measured more than 6,000 kilometers in length, the Great Wall is known as the long wall in the world. It has a long history of more than 2,000 years. That is amazing about the Great Wall is that it is main made of stones and bricks, and all the construction was done by hand. Though it was used to protect the country from foreign invaders, every few hundred meters along with the Great Wall, there was a watchtower. Now, as symbol of China, the Great Wall will become one of the most famous tourist attractions in the world. It is no wonderful that the Great Wall attract hundreds of thousands of foreign tourists every year.
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.
