The circadian rhythm is an internal clock in humans and animals that synchronize

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试卷: WELL AP v2模拟题 B卷[查看]
The circadian rhythm is an internal clock in humans and animals that synchronize physiological functions on a cycle of what duration?昼夜节律是人类和动物体内的一个内部时钟，以多长的周期使生理功能同步？
A: 12 hours 12小时
B: 1 hour 1小时
C: 6 hours 6小时
D: 24 hours 24小时

参考答案: D