职称英语理工类考试教材阅读理解重点文章以及译文(6)_职称英语阅读理解

　　练习：

　　A it controls when we wake，when we eat and when we sleep.

　　C it is a cycle also called circadian rhythm.

　　2. What is implied in the second paragraph?

　　B People after puberty begin to go to bed earlier due to the change of the biological clock.

　　D Teenagers go to bed later than they used to due to the light from the computer screen.

　　A it is natural for teenagers to stay up late and get up late.

　　C during puberty most teenagers experience a kind of gray cloud.

　　4. Which of the following statements is NOT true according to the fourth and fifth paragraphs?

　　B light gets through our eyes and resets our biological clock.

　　D Our internal clock，like the alarm clock，can be reset.

　　A The human eye had two light-sensing systems.

　　C The human eye could sense the light of day more quickly than the dark of night.

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