单项选择题

Small animals are said to live faster because they______.

A．have more skin for their weight
B．bum fuel faster than big ones
C．replace lost heat faster
D．keep a high body temperature
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单项选择题
The passage says that every animal is a radiator because it______.
A．takes in oxygen for burning fuel
B．burns fuel to produce heat
C．sends out heat through its skin
D．produces heat in its body cells
单项选择题
The amount of oxygen an animal uses depends on ______.
A．the length of time it lives
B．the food it eats
C．its size and shape
D．the heat the body produces
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