下面有几条从 “美国中学生守则”中摘录的校规。请你参照这些内容，给你们学校制定一条校规，并用事实说明制定该校规的理由。

One possible version:
I want to make a school rule. It’s “Don’t take mobile phones to school.”
Many of my classmates take mobile phones to school. They use them to play games. Sometimes they send messages to each other in class. Sometimes they read novels at night and often feel tired and sleepy in class the next day. Sometimes they even use phones to cheat in exams.
So I think it’s bad for students to take mobile phones to school. It affects not only themselves but also other students. What’s more, the students with phones may not be concentrated on their studies. Phones cost their parents money. （90words）
Possible version(2)
I want to make a school rule. It is “Don’t take mobile phones to school.”
Phones are more and more widely used, but in my opinion it’s not necessary for students to take mobile phones to school. I still remember one day in a math class, our math teacher was explaining a math problem when one of the boy students’ phone rang. All the other students turned to him. The teacher had to stop.
It not only affected the teacher but also affected ourselves in class. On the other hand, it costs parents money to buy the phones and they have to pay for their children to use the phone. (94 words)

内容要点：
(1）校规明确，事实清楚，理由充分，给高分（12分以上）。
(2)基本完成提出校规，给出事实，陈述理由，给及格左右分数（9分上下浮动）
(3)重点看事实和理由的表述部分。通过这一部分调节总体得分。