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 pollutionfree. 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 worried of industrial society.

　　Inherited factors also play some role. Most of the longest-lived people had parents and grandparents 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, Vilacbambans, 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.

　　41. What kinds of things contribute to the remarkable long life of these peoples?

　　A. Moderate diets

　　B. Clean mountain air.

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