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。
Environmental pollution does great harm to us. Tens of thousands of people die of disease caused by pollution. The area of desert in the world is growing and the weather is getting worst because the forest damage. The waste gas and liquid from factories have polluted air or rivers. Everyone is eager to get fresh air, pleasant weather and safe drunk water.
Luckily more and more people have realized what serious the problem is and they were trying their best to take measures to protect the environment. Therefore, we still need to encourage more and more people to join us in protecting their environment. Let's keep in the mind that protecting the environment is saving ourselves!
