1．使用的普遍性；
2．的优点；
3．的危害及我的建议。
写作导航：先指出当前使用很普遍，然后用事实(随处可见人们用通话，许多大学生、高中生都有)来支持主题句；的优点主要是方便通信，甚至上网，还体现在突发事件(疾病、交通事故)的求助上；的缺点主要是辐射和干扰他人，因此我建议尽量少用，重要场合(开会、上课时)关机。
范文：
Cell phones have become increasingly popular in China these days. Wherr you go you can see people using cell phones. Many college students, n 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. Further, if someone has a heart attack or a traffic accident, a call to emergency hospital or to the police can quickly bring him the he wants.
Howr, cell phones can also bring people problems. The most serious is the electric wave radiation which is thought to be harml 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.(英语作文)
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