单项选择题

Small animals are said to live faster because they______.

A．have more skin for their weight
B．bum fuel faster than big ones
C．replace lost heat faster
D．keep a high body temperature
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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
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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