题目内容：
根据下列文章,请回答题。Most young people enjoy physical activities, walking, cycling, football, or mountaineering.These who have a passion________26climbing high and difficult mountains are often________27with astonishment. Why are men and women ________ 28to suffer cold and hardship, and to ________ 29on high mountains? This astonishment is caused, probably, by the difference between mountaineering and other forms of activities ________ 30which men give their leisure.
There are no man-made rules, as there are for________31games as golf and football. There are, of course, rules of different kinds which it would be dangerous to ________32,but it is this freedom from man-made rules________33makes mountaineering attractive to many people. Those who climb mountains are free to use their own ________ 34
If we ________35mountaineering with other more familiar sports, we might think that one big difference is ________ 36mountaineering is not a "team work". However, it is only our misunderstanding. There are, in fact, no" matches"________________37"teams" of climbers, but when climbers are on a rock face linked by a rope on which their lives may________38, obviously, there is teamwork.
A mountain climber knows that he may have to fight with natural ________39that are stronger and more powerful than man. His sport requires high mental and ________ 40qualities.
A mountain climber________41to improve on skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions________42in their early twenties. But it is not ________ 43for men of fifty or sixty to climb the highest mountains in the Alps. They may take more________44than younger men, but they probably climb with more skill and less ________ 45of effort, and they certainly experience equal enjoyment. A．for
B．in
C．to
D．of
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