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

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热门试题

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

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