题目内容
（题文）近些年来，各方面的调查表明中学生的体质一直在下降，这种情况令人担忧。请以“How to keep healthy？”为题，写一篇70词左右的短文，谈谈你的看法和建议。
要求：
1. 短文必须包括以下内容提示，可以适当发挥。
2. 短文开头已给出，但不计入总词数。
内容提示：
1. 体质下降的原因， 如：eat too much junk food, have too much homework…
2. 关于保持健康的合理建议，如：exercise, eat a balanced diet(均衡饮食), enough sleep…How to keep healthy?
Nowadays middle school students' physical fitness is declining(下降) year by year. I think there are some reasons.
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