China has marked its National Winter Swimming Day. Many swimming lovers in the north of the country celebrated it on January 1st.
Winter swimming is a physical training. During it, you can have a cold wind bath, an icy water bath and a sunbath at the same time in the open air of winter.
When you have taken off clothes, all parts of your body are awakened by the cold. You may feel like going into the water, but a warm-up exercise is a must before jumping into the freezing water.
You go into the cold water and swim. The only thing you think about in the cold water is how to withstand（承受住）the cold. At this moment, your brain is relaxed and at rest. Then you come out just when your hands and feet are beginning to feel freezing.
After you get dried, your pink-colored skin is bathed in the winter sunshine. Slowly, you no longer feel cold. After the “three baths” of air, water and sun, you will feel warm, relaxed and comfortable.
Winter swimming is a way to keep fit. Many people find it a difficult sport, while its lovers say the sport makes them stronger. But it may not be fit for everyone. Before you decide to try, make sure you check you’re in good physical condition to do such a brave sport.
50. When you are swimming in the cold water, your brain is ______.
A. relaxed B. fresh C. active D. slow
51. After winter swimming, you will feel ______.
A. full B. healthy C. freezing D. comfortable
52. To take part in winter swimming, you must ______.
A. enjoy cold wind bath B. receive special training
C. check your physical condition D. take warm-up exercise every day