互动封闭仿真课堂1、智能交互 2、电子板书式视频教学 3、5分钟一次互动问答 4、封闭课堂
(2)Drink water and milk most often. Everyone knows that water is important. Besides that，kids need plenty of calcium(钙)to grow strong bones， and milk is rich in it. Every day，you should drink at least three cups of milk，when you are 9 years old or older. You should also try to have less sugary drinks，like soda and coca. They include a lot of sugar. Sugar only includes calories(热量)，not important nutrition.
(3)Listen to your body. When you are eating，notice how your body feels. When your stomach feels comfortably full，stop eating. Eating too much makes you feel uncomfortable. If you do it too often，it can make you unhealthy and fat.