填空题 A mountain climber continues to improve in skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions are in their early twenties. 1 They may take more time than younger men, but they probably climb with more skill and less waste of effort, and they certainly experience equal enjoyment.

• A. Most young people enjoy some form of physical activity.
• B. This astonishment is caused probably by the difference between mountaineering and other forms of activity to which men give their leisure.
• C. The mountain climber knows that he may have to fight forces that are stronger and more powerful than man.
• D. Those who climb mountains are free to use their own methods.
• E. But it is no unusual for a man of fifty or sixty to climb the highest mountains in the Alps.
• F. If we compare mountaineering and other more familiar sports, we might think that one big difference is that mountaineering is not a "team game".