Do you want to be healthy and thin? All of us will say: of course! But how to be healthy and thin? If you want to lose weight and keep healthy, the first way is to be on a diet. Eating too much is bad for your health and you will easily turn fat! The best way is to eat a little sugar, but more vegetables! The other way is to do more exercise! Sport is good for your health. You should keep running or walking for about twenty minutes every day. This is the most straightforward method. If you keep doing this for a long time, you will be more healthy.

(词汇提示：1) lose weight 减肥  2） be on a diet 按规定进食；节食  3）a little 少量的 
4）method方法  5）the most straightforward method最直接的方法)

①教师是人类文明的传递者

②教师是学生成长最关键的因素

③当今世界各国之间的竞争归根到底是综合国力的竞争

④教师肩负着塑造灵魂、塑造人的时代重任

在观察藓类叶片细胞的叶绿体形态与分布、植物根尖细胞的有丝分裂和花生子叶脂肪鉴定的三个实验中，它们的共同点是                             

书面表达。冬春交替，气温多变，很多人染上流感。为此，你班举行了“预防疾病以及防止病毒传播”为主题的班会。请根据下表内容，谈谈预防疾病以及防止病毒传播的简单方法，并阐述理由。

注意：1. 词数100左右；  2. 可根据内容要点适当增加细节，使行文连贯；3. 参考词汇：颗粒病毒：virus particles

    Hello， everybody！It's true that many people are infected with flu virus when the weather changes frequently.

Thank you.