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
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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
单项选择题
A．becameB．wentC．keptD．started
A．became
B．went
C．kept
D．started
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