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
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单项选择题
The subject of paragraph 6 is ______.
A．isolation
B．inherited factors
C．food and diet
D．animal meat
单项选择题
Scorpions injected with prostaglandins move to hot areas to ______.
A．engage in greater activity
B．seek out a more-iron environment
C．demonstrate that they are ill
D．develop a fever and fight bacterial infections
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