单项选择题

The subject of paragraph 6 is ______.

A．isolation
B．inherited factors
C．food and diet
D．animal meat
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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
单项选择题
Which of the following best states the main idea of the passage
A．Cold-blooded animals can develop fevers.
B．There are benefits to developing fevers.
C．Fevers inhibit bacterial growth.
D．Lizards can develop fevers.
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