In the Caucasus (高加索) region of the Soviet Union, nearly 50 out of every 100,000 people live to celebrate their 100th birthday,

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问题     In the Caucasus (高加索) region of the Soviet Union, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’ t stop at 100. By comparison, in America only 3 people  in 100,000 reach 100. But these Soviet old people aren’t alone. The Pakistani Hunzas, who live high in the Himalaya Mountains, and the Vilcabambans of the Andes Mountains (安第斯山脉) in Ecuador(厄爪多尔) seem to share the secret of long life too.
    These peoples remain healthy in body and spirit despite the passage of time. While many older persons in industrial societies become weak and iii in their 60s and 70s, some Soviet Georgians, aged 110 to 140, work in the fields beside their great grand children. Even the idea of aging is foreign to them. When asked, "At what age does youth end?" most of these old people had no answer. Several replied, "Well, perhaps at age 80." The very youngest estimate was age 60.
    What accounts for this ability to survive to such old age, and to survive so well? First of all, hard physical work is’ a way of life for all of these long-lived peoples. They begin their long days of physical labor as children and never seem to stop. For example, Mr. Rustam Mamedov is 142 years of age. He remembers his life experiences: The Crimean War of 1854; the Turkish War of 1878; the Bolshevik Revolution in 1917. His wife is 116 years old. They have been married for 90 years. Mr. Mamedov has no intentions of retiring from his life as a farmer. "why? What else would I do?" he asks. Oh, he’s slowed down a bit. Now he might quit for the day after 6 hours in the field instead of 10.
    All these people get healthful rewards from the environment in which they work. They all come from mountainous regions. They live and work at elevations of 5,000 to 12,000 feet (1,660 to 4,000 meters) above sea level. The air has less oxygen and is pollution free. This reduced oxygen environment makes the heart and blood vessel system stronger.
    Another factor that may contribute to the good health of these people is their isolation. To a great extent, they are separated from the pressures and worries of industrial society.
    Inherited factors also play some role. Most of the longest lived peoples had parents and grand parents who also reached very old ages. Good family genes may, therefore, be one factor in living longer.
    Finally, although these three groups don’t eat exactly the same foods, their diets are similar. The Hunzas, Vilcabambans, and Soviets eat little animal meat. Their diets are full of fresh fruits, vegetables, nuts, grains, cheese, and milk. They never eat more food than their bodies need.
    It is clear that isolation from urban pressures and pollution, clean mountain air, daily hard work, moderate diets, good genes, and a youthful approach to life all contribute to the health and remarkable long life of all these people.
All the long lived people in the author’s research don’ t______.

选项 A、come from mountainous regions
B、live and work at far higher elevations above sea levels
C、come from the modem industrial society
D、have grand children and great grand children

答案C

解析 文中第四段说,所有长寿之人都从他们所工作的环境中得到健康的回报。他们都来自山区。生活在海拔5000到12000英尺以上。空气稀薄无污染。第五段里又介绍说他们远离工业社会的压力与烦恼。所以A和B项不正确。对于D项,长寿人一般都会有儿女,孙子,从孙子,曾孙子,这是自然的事。C项符合题意。
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