Advantages and Disadvantages of Cell Phones(手機的利弊)
1．手機使用的普遍性；
2．手機的優點；
3．手機的危害及我的建議。
[寫作導航]先指出當前手機使用很普遍，然後用事實(隨處可見人們用手機通話，許多大學生、高中生都有手機)來支持主題句；手機的優點主要是方便通信，甚至上網，還體現在突發事件(疾病、交通事故)的求助上；手機的缺點主要是輻射和干擾他人，因此我建議儘量少用，重要場合(開會、上課時)關機。
[範文]
Cell phones have become increasingly popular in China these days. Wherever you go you can see people using cell phones. Many college students, even high school students, have cell phones.
Cell phones have brought people a lot of benefits, but the most important is that they are convenient. With cell phones in their hands, they can keep in touch with anybody they want. If they want to get some information from the Internet, they can easily have their dream realized via cell phones too. Furthermore, if someone has a heart attack or a traffic accident, a call to emergency hospital or to the police can quickly bring him the help he wants.
However, cell phones can also bring people problems. The most serious is the electric wave radiation which is thought to be harmful to users＇ brains. Another problem is that when people are having a meeting or having a class or at a concert etc, the ring of the cell phone may interrupt others. So I think people should use cellphones as little as possible and turn them off when they are attending important meetings or attending classes.