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
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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
Which of the following statements is true
A．Developing fever is the privilege of warm-blooded animals, so sick lizards can not run a fever.
B．Invertebrates also have the ability to raise their temperature.
C．The internal temperatures of warm-blooded creatures are independent of the weather, so are the coldblooded animal.
D．Sick lizards move into the sun to develop fever.
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