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
Small animals are said to live faster than big ones because they ______.
A．have more skin for every ounce of body weight
B．replace lost heat faster
C．bum fuel faster
D．maintain a higher body temperature
单项选择题
Spiders hold their planetary seat with assurance because they are ______.
A．more numerous than any other species
B．able to adapt to hostile environments
C．masters of the earth's surface
D．all of the above
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