第二节 完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Nowadays many people enjoy 36 activities—walking, cycling or mountaineering.
People often 37 the act of climbing high and difficult mountains to be astonishing. Why are men and women 38 to suffer cold and hardship, and to 39 on high mountains? This astonishment may be caused by the difference between mountaineering and other forms of activities to which men 40 their leisure time.
There are no man-made rules, as there are for 41 sports as golf and football. There are, of course, principles of different kinds. It would be dangerous if you 42 them. But it is this freedom from man-made rules 43 makes mountaineering attractive to many people. Those who climb mountains are free to choose their own 44 .
If we 45 mountaineering with other more familiar sports, we might think that one big difference is that mountaineering is not a kind of 46 work at all. 47 , it is only our misunderstanding. There are no “matches” 48 “teams” of climbers, but when climbers are on a rock face linked by a rope which their lives may 49 , there is obviously teamwork.
A mountain climber knows that he may have to fight with natural 50 that are stronger and more powerful than man.
