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
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
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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