单项选择题

The selection says that every animal is a living radiator because it ______.

A．produces heat in its body cells
B．burns fuel to produce heat
C．gives off heat through its skin
D．requires oxygen to produces heat
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单项选择题
The writer is amazed by the black spider' s ______.
A．delicate construction
B．ability to live in such varied environments
C．unusual intelligence
D．ability to withstand extreme cold
单项选择题
The author thinks that spiders ______.
A．rival man as master of the earth
B．are as firmly established on the earth as man
C．are more vigorous than man
D．are more firmly established on the earth than man
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