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 writer is amazed by the black spider' s ______.

A．delicate construction
B．ability to live in such varied environments
C．unusual intelligence
D．ability to withstand extreme cold