In the Caucasus Mountains, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’t stop at 100!In American only 3 people in 100,000 reach 100．But these old people aren’t alone．The people who live high in the Himalaya Mountains and the Andes Mountains, seem to share the secret of long life, too．
First of all, hard physical work is a way of life for all of these long-lived people．They begin their long days of physical work as children and never seem to stop．For example, Mr．Rustam is 142 years of age．He has experienced several wars．His wife is 116 years old．They have been married for 90 years．Mr．Rustam doesn’t want to stop his work as a farmer．“Why? What else would I do?” He asks．Oh, he has slowed down a bit．Now he might work for 6 hours in the field instead of 10．
Another factor(因素)that may contribute(有助于)to the good health of these people is their isolation．Most of them are kept off the modern world．
Inherited(遗传的)factors also help．Most of the longest-lived people had parents and grandparents who also reached very old ages．So good families genes(基因)may be one factor in living longer．
Finally, although these three groups don’t eat exactly the same food, they 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．
(1)
Which of the following contributes to the good health of all these long-lived people?．
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A．
Fresh air in the mountains．
B．
Hard physical work．
C．
Good family genes．
D．
The same food．
(2)
What does the underlined word “isolation” mean in Chinese?
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