单选题
The speed at which an animal lives is determined by measuring ______.
A、
the amount of food it eats
B、
its body temperature
C、
the rate at which it uses oxygen
D、
the amount of oxygen it uses
【正确答案】
C
【答案解析】
第二段明确指出The speed at which an animal lives is determined by measuring the rate at which it uses oxygen，因此可以直接得出答案。
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