单选题
Warm-blooded animals maintain a steady temperature by ______.
A、
storing heat in their body cells
B、
regulating the amount of heat produced
C、
regulating the amount of heat given off
D、
constantly replacing lost surface heart
【正确答案】
D
【答案解析】
第一段明确指出恒温动物通过constantly replacing lost surface heat来保持体温。
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