单项选择题

The speed at which an animal lives is determined by measuring ______.

A．the amount of food it eats
B．its body temperature
C．the rate at which it uses oxygen
D．the amount of oxygen it uses
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单项选择题
Warm-blooded animals maintain a steady temperature by ______.
A．storing heat in their body cells
B．regulating the amount of heat produced
C．regulating the amount of heat given off
D．constantly replacing lost surface heart
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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