Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, in winter, or skating or skiin

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问题   Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, in winter, or skating or skiing. It may be a game of some kind — football, hockey, golf or tennis. It may be mountaineering.
  These who have a passion【C1】______climbing high and difficult mountains are often【C2】______with astonishment. Why are men and women【C3】______to suffer cold and hardship, and to【C4】______on high mountains? This astonishment is caused, probably, by the difference between mountaineering and other forms of activity【C5】______which men give their leisure.
  Mountaineering is a sport and not a game. There are no man-made roles, as there are for【C6】______games as golf and football. There are, of course, rules of different kinds which it would be dangerous to【C7】______, but it is this freedom from man-made rules【C8】______makes mountaineering  attractive to many people. Those who climb mountains are free to use their own【C9】______.
  If we【C10】______mountaineering with other more familiar sports, we might think that one big difference is【C11】______mountaineering is not a" team work". We should be mistaken in this. There are, it is true, no "matches"【C12】______"teams" of climbers, but when climbers are on a rock face linked by a rope on which their lives may【C13】______, there is obviously teamwork.
  A mountain climber knows that he may have to fight forces that are stronger and more powerful than man. He has to fight【C14】______of nature. His sport requires high mental and【C15】______qualities.
  A mountain climber【C16】______to improve in skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions【C17】______in their early twenties. But it is not【C18】______for men of fifty or sixty to climb the highest mountains in the Alps. They may take more【C19】______than younger men, but they probably climb with more skill and less【C20】______of effort, and they certainly experience equal enjoyment.
【C17】

选项 A、will be
B、appear
C、are
D、is

答案C

解析 此处是一般现在时,表示一个事实,排除A项。B项 appear后不接介词短语表示年龄。系动词be+in+one’s twenties表示“在某人二十多岁时”。因为主语是名词复数,故选C。
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