假如你是李华，21世纪报就“怎样保持中学生身体健康”的问题向你征求意见，请以书信的形式给编辑写一封信，词数100左右。
主要内容包括：
1. 饮食均衡
2. 适量的体育锻炼
3. 其他个人建议（可以适当发挥）
Dear Editor,
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Dear Editor,
I’m glad to receive your letter. In my opinion, health is most important for any of us. In order to stay healthy, we need some common knowledge.
Firstly, pay attention to the diet. We should eat a lot of fruits and vegetables, because they are rich in fiber and low in fat. Meanwhile, sugar should be eaten in proper quantity, because too much sugar does harm to us. Don’t drink too much coffee, either. Secondly, exercise is necessary. Regular exercise can help us keep form getting too fat. People who do running every day usually have stronger hearts than who don’t. Finally, form good living habits. We should sleep about 8 hours at night and stay away from cigarettes.
On balance, as long as we keep a balanced diet and take exercise regularly , we can keep fit.
Yours
Li Hua
Yours