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
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
Fevers cause ______.
A．prostaglandins to be formed
B．iron to be made available to bacteria
C．leukocytes to be more mobile
D．lizards to be cold-blooded animals
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