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

How do you think the author feels about these long-lived people

A．He is impressed with them.
B．He doesn't care.
C．He doesn't like them.
D．He cares little about them.

单项选择题

The subject of paragraph 6 is ______.

A．isolation
B．inherited factors
C．food and diet
D．animal meat