听力原文：Yoga becomes very popular nowadays, but it is important that we understand a few

听力原文： Yoga becomes very popular nowadays, but it is important that we understand a few facts about it. First of all, it is not a religion. Yoga is a way of life and can serve only to improve your present way of life. Yoga is an exact science and a delicate art. Secondly, be as mechanical as possible. Never strain or pull too much. Forcing will cause your body to resist and will actually slow down or even prevent your progress. Go gently. Stretch up to the point where it would start to hurt, then stop immediately. The key is the proper breathing through the nostrils with the mouth shut. Usually it is best to practise alone in a room with fresh air, wearing little or no clothing. Never practise on a full stomach because an empty stomach permits greater flexibility. Exercise will benefit your general health. Yoga cannot add or reduce pounds from your figure; only eating less or more food can do that. Always remember that diet affects weight, while exercise affects shape. Neither can do the job of the other.

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A．A delicate art.

B．A religion.

C．An exact science.

D．A way of life.