假設(shè)你是劉勇，你的朋友露西（Lucy）向你詢問(wèn)如何保持健康。請(qǐng)你給她發(fā)封電子郵件提些建議。內(nèi)容要點(diǎn)如下：
（1）注意合理飲食。多吃魚(yú)、蛋和豆類等，特別是新鮮蔬菜和水果，不要吃太多甜食。
（2）堅(jiān)持鍛煉身體。勞逸結(jié)合，多參加體育活動(dòng)。
（3）保證充足的睡眠。不要熬夜，每天至少睡8個(gè)小時(shí)。

【考點(diǎn)】應(yīng)用文；環(huán)境保護(hù)．

【答案】Dear Lucy，
   How nice to hear from you!In your letter you asked me how to keep healthy.I would like to give you some advice.
   As you know，we teenagers grow very fast，so we need plenty of nutritious foods，such as fish，meat，and beans，especially fresh vegetables and fruits.You'd better not eat too much food rich in sugar or fat.Besides，you should take physical exercise regularly instead of studying in the classroom all the time.For example，you can play basketball with your friends or swim after school.What's more，having enough sleep is very important.So I advise that you should have at least eight hours of sleep every day and not stay up too late in the evening.Only in this way can you keep fit.
Yours，
Liu Yong