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单项选择题

The passage says that every animal is a living radiator because it ______.

A．produces heat in its body cells
B．burns fuel to produce heat
C．sends out heat through its skin
D．takes in oxygen for burning fuel

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单项选择题What can we infer from the text

A．There is no limit as to how large a warm-blooded animal can be.
B．The humming-bird lives faster than any other warm-blooded animals.
C．Small animals have less skin for their body weight than large ones.
D．The humming-bird is the smallest of the warm-blooded animals.

单项选择题Small animals are said to live faster than big ones because they ______.

A．have more skin for their weigh
B．replace lost heat faster
C．burn fuel faster than big ones
D．keep a higher body temperature