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：在错的词下画一横线，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只限一词；
2．只允许修改10处，多者(从第11处起)不计分。
In recent years, the sandstorm in the northern part of China has become more and more common natural disaster. The strong wind blows up some sand, making them difficult for people to go out. Sandstorms are caused by a variety of reason. First, in the past people feed a great number of sheep. As a result, the sheep ate so many grass that the land turned into deserts. Second, people were not concerning about protecting forests, and cut down many trees, that caused the loss of soil. When it comes to improve the situation, the government starts to stress at the importance of the environment. I believe final the problem will be solved in the near future.
