书面表达。
汤姆因在学校使用手机被学校处分，他感到很困惑，写信给你求助。请根据以下结构提示给
汤姆回信。开头结尾已给出。
Beginning: Your letter reached me yesterday. It said in your letter that...
Paragraph 1: 手机的优点：联系便捷
Paragraph 2: 带手机上学存在的问题：干扰教学，有害学习和健康
Ending: It is right for school to prevent you from using cell phones in school.
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