D. It needs water and much energy to keep its courses green.

　　70. 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

　　71. The author writes the passage to_______.

　　A. show us the function of major sports

　　B. introduce different types of sports

　　C. discuss the major influence of popular sports

　　D. encourage us to go in for green sports

　　E

　　Some years ago on a hot summer day in south Florida a little boy decided to go for a swim in the lake behind his house. He swam towards the middle of the lake, not realizing that a crocodile was swimming toward him. His mother, who was in the house, was looking out of the window and saw the two. In great fear, she ran toward the water, shouting to her son as loudly as she could. Hearing her voice, the boy became alarmed and swam back. It was too late. Just as he reached her, the crocodile reached him. The mother grabbed her little boy by the arms just as the crocodile snatched his legs. The crocodile was much stronger than the mother, but the mother was much too passionate to let go. A farmer happened to drive by, heard their screams, raced from his truck, took aim and shot the crocodile.

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