1 . 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。

In recent years, Lake Baikal, the deepest freshwater lake, has paid much attention to because of a extreme sport. Each March, about 150 people signed up for the Baikal Lake Marathon. They come to explore the lake's extraordinarily beauty and challenge themselves in unpredictable conditions. And on March, the ice is a meter thick and very hard. Runners cross the frozen surface, finishing on the western sides of the lake. Knowing as the “blue eye of Siberia," the lake has clear water. When seen from above, runners on the ice look as if he were jogging through space. The landscape might to be beautiful but it is a severe test. Runners say the cold climate is that draws them.