题目内容：

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。

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。

With the opening-up steps and economic development, so the beautiful scenery and good air quality in Guizhou is catching the attention of travelers. Nothing well can remain a secret for too long. Beside, there is also a forest park locating in the city center, which is the largest city forest park in China. Scientists say that in much areas in these forests, the quantity of oxygen reached 50,000/cm3. That is tens of times those of the area outside the city. The city is the natural oxygen bar, free from pollution and providing visitors and residents a refreshing break from the stress of modem life.