急求一篇关于on line chat的四级水平作文,提前谢谢啦!

嗬嗬，犯懒了，写写提纲好了。

开头：
Online chat has become increasingly popular among the public, especially young people. Along with the rapid development of the internet, online chat has proved itself a rather convenient and efficient way of communication.

优点（可选）：
Firstly, cheap... comparing with telephone...

Second, convenient... not limited by distance... and without time-delay...

Third, vedio online chat... much more advanced than telephone, mail and email.

Fourth, express your opnion without your identification known to others... quote "On the internet, nobody knows even if you are a dog." Thus more free to express one's opinion.

缺点（可选）：
First, you are uncertain about who you are talking with. without good discipline, online chat can be harmful to teenagers....

Second, one can be addicted to such a chat and be distract from his study and work...

总结：
To sum up, online chat