2. 外语
  3. A、Our biological clocks are controllable before ten years old. B、Teenagers should learn to control their biological clocks. C、Sl

A、Our biological clocks are controllable before ten years old. B、Teenagers should learn to control their biological clocks. C、Sl

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问题
选项 A、Our biological clocks are controllable before ten years old.
B、Teenagers should learn to control their biological clocks.
C、Sleeping time should vary with the biological clocks.
D、Teenagers’ biological clocks are easily out of control.
答案C
解析 从本文第一段开始，我们就知道Kelley认为中学生应该推迟上课时间，因为他们的生物钟与小孩或成人都不同，第3段中间部分通过Professor Foster的研究再次强调这一个观点：生物钟发生变化。睡眠时间就应相应变化，C表达了相同的观点，故为本题答案。
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