B. food

　　C. oxygen

　　D. water

　　The passage mainly talks about ________.

　　A. the USA’s new plan for space exploration B. how to build a base on the moon

　　C. why to ensure the survival of the species D. where to get new natural resources

　　C

　　Have you ever tried to hold your breath for a long time and then let it out slowly? This is one of the techniques of an ancient Indian exercise known as Yoga. For thousands of years, people have used Yoga to help search for happiness and pleasure.

　　Students of Yoga often study for as long as 20 years before becoming masters, or Yogis. They learn many different physical exercises. These exercises are designed to put the students in good physical condition. Then they can concentrate on deep thought without worrying about physical discomforts.

　　Many yoga exercises require to put the body into difficult positions. Some of them are very hard to learn. Have you ever tried to cross your legs over one another? This is one of the basic Yoga positions. Most people find it difficult to stay in that position for even a few minutes. But Yogis train themselves to remain in the position for hours or even days. They are taught to overcome the physical discomforts of holding these positions. Other exercises and rules teach concentration－Yogis feel this is the key to finding inner peace. This kind of concentration is called meditation.

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