单项选择题

A．In a zoo.
B．In a laboratory.
C．In a mountain.
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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
The author states that birds left the tropics because______.
A．there were too many glaciers
B．there were too many birds
C．there was not enough food there in winter
D．there was too' much daylight
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