第二节：书面表达（总分25分）
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。所给要点必须写到外，自己可以适当补充相关细节。字数：90----100。
Paragraph 1: 手机的优点：联系方便（方便convenient）
Paragraph 2: 带手机上学存在的问题：影响教学，花大量时间打手机有害学习和健康
Your letter reached me yesterday. You said in your letter that                        
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It is right for school to prevent you from using cell phones in school.