单项选择题

What is the main subject of this passage

A．Mr. Mamedov's life.
B．A description of several societies where people live a long time.
C．Suggestions for how you can live a long life.
D．Hard physical work is a good way to live a long tim

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单项选择题

The description of Mr. Rustam Mamedov is ______.

A．an example of a typical long life among these people
B．an example of an unusual long life among these people
C．an explanation of why he is still healthy
D．an explanation of what way of life we should take

单项选择题

This article concludes that ______ contribute to the remarkable long life of these peoples.

A．moderate diets
B．clean mountain air
C．daily hard work
D．all the above factors