单项选择题

An animal weighing less than 2.5 grams would starve because it would not be able to ______.

A．get enough oxygen
B．maintain its body temperature
C．bum its food fast enough
D．eat fast enough to supply fuel
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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
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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