单项选择题

The subject of paragraph 7 is _________

A．isolation
B．inherited factors
C．food and diet
D．animal meat
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单项选择题
In the last paragraph (about 120) is in parentheses to show ________.
A．that it is unimportant
B．how many tribes there are
C．that it is a large number
D．how many people there are
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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