单项选择题

The passage says that every animal is a radiator because it______.

A．takes in oxygen for burning fuel
B．burns fuel to produce heat
C．sends out heat through its skin
D．produces heat in its body cells
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单项选择题
The amount of oxygen an animal uses depends on ______.
A．the length of time it lives
B．the food it eats
C．its size and shape
D．the heat the body produces
单项选择题
Why is lightweight luggage important for a traveling businesswoman
A．It allows to be moved easily.
B．It can keep most needed papers.
C．It provides space for dirty clothes.
D．It is big enough to carry business papers.
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