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 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．

　　47.Which of the following is the author most probably in favor of?

　　A.Cycling around a lake．

　　B.Motor racing in the desert．

　　C.Playing basketball in a gym．

　　D.Swimming in a sports center．

　　48.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 wastes．

　　D.It needs water and electricity to keep its courses green．

　　49.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

　　50.The author writes the passage to _________．

　　A.show us the function of major sports

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