随着人们生活水平日益提高和手机收费不断降价，手机已经成为人们日常生活中的必需品，也开始大量涌入中学校园。由此引发一场观念碰撞：中学业生该不该带手机？请你围绕 “Is it necessary for a middle school student to carry a mobile phone?”这个问题，参考所给要点，写一篇英语短文。
要点：
1．带手机的好处；
2．带手机的不利因素；
3．我的观点是：
注意：
1．词数100~120，短文开头已给出（不计词数）
2．参考词汇：convenient 方便的 the electric wave radiation电波辐射
Nowadays mobile phones are becoming more and more popular in China. As is said, there are more than 500 million mobile users in our country. Sometimes you can even see students using them.
Mobile phones have brought people a lot of benefits, but the most important is that they are convenient. If there is a sudden accident at school, It is much quicker for us to dial for help.
However, mobile phones can also bring people problems. The most serious is the electric wave radiation which is thought to be harmful to users’ brain. Another problem is the when we are having a lesson, the ring of the mobile phone may interrupt us. Last but not the least, students may spend a lot of time playing games in the mobile phone as well as sending short messages.
In my opinion, because there are more disadvantages than advantages, it is not necessary for us students to carry a mobile phone at school.