单选题 Most young people enjoy some form of physical activity. Those who have a passion for climbing high and difficult mountains are often looked upon with astonishment. Why are men and women willing to suffer cold and hardship, and to take risks on those high mountains? This astonishment is caused probably by the difference between mountaineering and other forms of activity to which men give their leisure.
Mountaineering is a sport and not a game. There are no man-made rules, as there are for such games as golf and football. It is this freedom from man-made rules that makes mountaineering attractive to many people. Those who climb mountains are free to use their own methods.
If we compare mountaineering and other more familiar sports, we might think that one big difference is that mountaineering is not a "team game". We should be mistaken in this. There are, it is true, no "matches" between "teams" of climbers, but when climbers are on a rock linked by a rope on which their lives may depend, there is obviously teamwork.
The mountain climbers know that he may have to fight forces that are stronger and more powerful than man. He has to fight the forces of nature. This sport, hence, requires his high mental and physical qualities.

单选题 What is the proper title for this passage?

单选题 The main difference between a sport and a game lies in ______.

单选题 Which of the following is NOT true?

单选题 The main reason why mountaineering attracts so many people is that ______.

单选题 The main reason why mountain climbers are looked upon with astonishment is that ______.