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. But it is no unusual for a man 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 waste of effort, and they certainly experience equal enjoyment.

　　66. Mountaineering is a sport which involves .

　　A) hardship

　　C) physical risk

　　B) cold

　　D) all of the above

　　67. The main difference between a sport and a game lies in .

　　A) uniform

　　C) rules

　　B) activity

　　D) skills

　　68. Mountaineering is also a team sport because .

　　A)it involves rules

　　B)it involves matches between teams

　　C)it requires mental and physical qualities

　　D)mountaineers depend on each other while climbing

　　69. Which of the following is NOT true?

　　A) Mountaineers compete against each other.

　　B) Mountaineers compete against other teams.

　　C) Mountaineers compete against nature.

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