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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