阅读短文，根据短文内容回答问题。（共10分，每小题2分）
On a very hot day, it is hard to know what to do to feel good. If you run around, you may feel sick in your stomach. However, if you just sit quietly and do nothing, you may feel bored. Are there things you can do to feel good and have fun when you’re hot?
Perhaps playing in water is a good choice to make you cool down. Taking a cool bath or shower, or even washing toys in a pan of cool water can also make you feel good on a hot day. Besides, you can read stories or paint in front of a fan. You don’t need to move your body very much. These are just some of the cool things to do on a hot day.
In addition, it’s important for you to drink water. On hot days, you can lose about 16 glasses of water in one day. If you feel thirsty, you are already short of water. So don’t wait for thirst before you start to drink. You should try to drink as much water as you lose every day. Mixing a little fruit juice into your water is a fun way to help you drink plenty of water.
The food you eat also makes a difference in how you feel in the heat. Cold foods such as ice cream and drinks with some ice can cool down your bodies. Fruits and vegetables are also helpful to stay cool in hot weather. So plan a healthy menu for a hot day---one that doesn’t need any cooking.                                                               
Is it easy to know what to do to feel good on a hot day?
Is playing in water a good choice or a bad one?
How much water do we lose one day in hot weather?
What is a healthy menu for a hot day?
What is the writer’s purpose of writing this passage?