Why do so many people live to a healthy old age in certain parts of the world? What is the【B1】______of their long lives? Three t

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问题     Why do so many people live to a healthy old age in certain parts of the world? What is the【B1】______of their long lives? Three things seem to【B2】______to it: fresh air, fresh food and a simple way of life. People work near their homes in the clean, mountain air instead of travelling long【B3】______to work by bus, car or train. They do not sit all day in【B4】______offices or factories, but work hard outdoors in the fields. They take more exercise and eat less food than people in the cities of the West. For years, the Hunaz of the Himalayas did not need policemen, lawyers or doctors. There was no crime, no【B5】______and not much illness in their society. They were a happy, peaceful people, famous all over India for their long, healthy lives.
    Although many people are keen on【B6】______out ways to live a longer life, there are people worrying about their【B7】______years. Once a retired doctor I【B8】______shared with me his worries: It’s only natural to look forward to something better.【B9】______. It is one of life’s great ironies that the longer we live, the less there is to look forward to. Retirement may bring with it the fulfillment of a lifetime’s dreams.【B10】______. From then on, the dream fades.【B11】______.Who wants to live long enough to become a doddering wreck? Who wants to go back to that most dreadful of all human conditions, a second childhood?
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解析 空前的seem to表明,本空应填入一个原形动词,并且能与to连用,构成搭配。
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