单项选择题

______doesn't contribute to the remarkable long life of these people.

A．Moderate diet
B．Clean mountain air
C．Daily hard work
D．Long physical height
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单项选择题
This passage primarily describes______.
A．Mr. Mamedov' s life
B．factors that contribute people to a long life
C．suggestions for how you can live a long life
D．hard physical work is a good way to live a long life
单项选择题
In the Caucasus region of the Soviet Union______.
A．many people can live up to more than 100 years
B．many old people live very lonely
C．many people from other mountainous region come to settle here
D．many older persons become weak and ill in their 60s and 70s for no reason
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