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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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
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 time.
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