B staying up late has a bad effect on teenagers ability to think and learn.
C during puberty most teenagers experience a kind of gray cloud.
D it is hard for teenagers to get out of bed in the morning.
4. Which of the following statements is NOT true according to the fourth and fifth paragraphs?
A Our biological clock resets itself automatically.
B light gets through our eyes and resets our biological clock.
C Our internal clock as well as the alarm clock can be reset automatically.
D Our internal clock,like the alarm clock,can be reset.
5. According to the last two paragraphs, what did the previous researchers think about the human eyes light-sensing system?
A The human eye had two light-sensing systems.
B The human eye had one light-sensing system.
C The human eye could sense the light of day more quickly than the dark of night.
D The human eye could reset our internal clocks in accordance with the alarm clocks.
答案与题解:
1.B 第一段第二句提供了答案。句中的your internal clock 即指a clock located inside our Brains。
2. C 第二段主要内容是告诉读者,过了青春期(puberty),由于生物钟节奏的变化,青少年(adolescents and teenagers)比以前要晚睡几小时。所以C是该段所隐含的内容。
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