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
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单项选择题
The amount of oxygen an animal uses determine ______.
A．the heat the body produces
B．the food it eats
C．its size and shape
D．the length of time it lives
单项选择题
He didn't describe the subject fully. He spoke ______.
A．in general
B．in particular
C．in common
D．in short
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