问题详情：
Sports can help you keep fit and get in touch with nature. However, whether 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 sorts of chemicals and huge amounts of energy are used to keep its courses（球场）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 weight 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（代替物）for traditional health clubs and modern sports centers. 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.
21．Which of the following is the author most probably in favor of?
A. Playing basketball in a gym B. Motor racing in the desert.
C. Cycling around a lake. D. Swimming in a sports center.
22．What do we know about golf from the passage?
A. It is popular in Portugal and Spain.
B. It needs water and electricity to keep its courses green.
C. It pollutes the earth with chemicals and wastes.
D. It causes water shortages around the world.
23．The author uses power walking as an example mainly because .
A. it uses fewer resources B. it improves our health
C. it is an outdoor sport D. it is recommended by experts
24．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
【回答】
CBAB
知识点：阅读理解
题型：阅读理解
