单选题 Most young people enjoy physical activities, walking, cycling, football, or mountaineering.
These who have a passion for climbing high and difficult mountains are often 1 with astonishment. Why are men and women willing to suffer cold and hardship, and to 2 on high mountains? This astonishment is caused, probably, by the difference between mountaineering and other forms of activities 3 which men give their leisure.
There are no man-made rules, as there are for 4 games as golf and football. There are, of course, rules of different kinds which it would be dangerous to ignore, but 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 5 .
If we 6 mountaineering with other more familiar sports, we might think that one big difference is that mountaineering is not a "team work". However, it is only our misunderstanding. There are, in fact, no "matches" 7 "teams" of climbers, but when climbers are on a rock face linked by a rope on which their lives may depend, obviously, there is teamwork.
A mountain climber knows that he may have to fight with natural 8 that are stronger and more powerful than man. His sport requires high mental and physical qualities.
A mountain climber continues to improve on skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions 9 in their early twenties. But it is not unusual for men of fifty or sixty to climb the highest mountains in the Alps. They may take more time than younger men, but they probably climb with more skill and less
10 of effort, and they certainly experience equal enjoyment.

【正确答案】 D

【答案解析】[解析] 此题考查动词短语的搭配和对文意的理解。A项look up to意为“仰慕，尊敬(某人)”；B项look forward意为“期待，盼望”，与介词to搭配；C项look into意为“调查(问题、罪行等)”；只有D项look upon(又作look on)有“把…看作，把…视为”之意，符合原文的意思。

【正确答案】 C

【答案解析】[解析] 此题考查短语辨析和对文意的理解。B项run risk意为“冒险”，有被动地处于危险之中的意思；C项take a risk也为“冒险”之意，但不同于B项，这里有明知道有危险也要主动去冒险的意思。根据上下文推测，既然登山者愿意遭受严寒克服困难，应该是主动去冒险。