题目内容：

    How to study for 10t hours a day without getting tired Get yourself some good coffee and great green tea. Have a cup of coffee and a cup of green tea beside you while you are studying. The coffee has caffeine（咖啡因），which keeps you refreshed（有精神的），and the green tea has theanine（茶氨酸），which keeps you relaxed and happy.  1. It helps refresh you and makes you concentrate on your study.

2. This is important. You need to have a period of relaxation time at the end of the day. Relaxation time is important because it is the time that your mind consolidates（巩固）all the information you receive during the day.

Tell yourself that you're training for becoming better and better. Keep yourself healthy and happy. Regard this as your purpose. 3. Be sure that you can do this！ This is your task. And you have to complete it.

Learn to keep the mind quiet. 4. When you are studying，you will sit down for long periods of time. So make sure you have a good yoga（瑜伽）exercise，which can help quiet your mind.

5. Every Sunday，write out what you will do over the week. And every day before bed，write out what you will do the next day. Then mark everything as you do it. This will give you happiness because you will feel a sense of achievement every day.

A. Keep a to-do list.

B. Relax yourself at the end of the day.

C. This combination（组合）is very fantastic.

D. There's nothing tiring about living your purpose.

E. Taking 20 minutes' exercise a day is good enough.

F. This will also make sure that you pay attention to what you study.

G. The best way to make your mind calm is to listen to light music or do yoga.