Sports can help you keep fit and get in touch with nature. However, whether you you are on the mountains, in the waves, or on the grassland, you should be aware that your sport of choice might have great influence on the environment. Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all sort of chemicals and huge amounts of energy are used to keep its courses in good condition. This causes major environmental effects. For example, in the dry regions of Portugal and Spain, golf is often held responsible for serious water shortage in some local areas. There are many environment-friendly sports. Power walking is one of them that you could take up today. You don’t need any special equipment except a good pair of shoes; and you don’t have to worry about resources and your purse.. Simple and free, power walking can also keep you fit. If you walk regularly, it will be good for your heart and bones. Experts say that 20 minutes of power walking daily can make you feel less  anxious, sleep well and have better control. Whatever sport you take up, you can make it greener by using environment-friendly equipment and buying products made from recycled materials. But the final goal should be “green gyms”. They are better replacements for traditional health clubs and modern sports centres. Members of green gyms play sports outdoors, in the countryside or other open spaces. There is no special requirement for you to start your membership. And best of all, it’s free. 68. Which of the following is the author mostly probably in favour of(支持)? A. Cycling around a lake        B. Motor racing in the desert C. Playing basketball in a gym.   D. Swimming in a sports center. 69. What do we know about golf from the passage? A. It is popular in Portugal and Spain B. It causes water shortages around the world. C.It pollutes the earth with chemicals and waste D. It needs water and electricity to keep its courses green. 70. The author uses power walking as an example mainly because____. A. it is an outdoor sport        B. it improves our health C. it uses fewer resources      D. it is recommended by experts. 71. The author writes the passage to _________. A. show us the function of major sports. B. encourage us to go in for green sports. C. discuss the major influence of popular sports. D. introduce different types of environment-friendly sports.