According to the last two paragraphs, what did the previous researchers think about the human eye's light-sensing system?
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1 .McCarty became famous because _______.
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A it controls when we wake, when we eat and when we sleep B it has a cycle of 24 hours C it is a cycle also called circadian rhythm D it can alarm any time during 24 hours
3 .What is implied in the second paragraph?
A Young children's biological clock has the same rhythm with that of the teenagers. B People after puberty begin to go to bed earlier due to the change of the biological clock. C Children before puberty tend to fall asleep earlier at night than adolescents. D Teenagers go to bed later than they used...
4 .In the third paragraph the author wants to tell the reader that _____.
A it is natural for teenagers to stay up late and get up late 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
5 .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.
7 .What would change the future of electronics according to engineers?
A Big technology. B Creative ways. C Graphene. D Both A and B.
8 .According to the second and third paragraphs, what is true of graphene?
A It can be used to make paper. B It is possible to see it with our naked eye. C It is easy to find graphene. D It is possibly the thickest material in the world.
9 .Which of the following can be used to replace the word “apply” in paragraph4?
A request B polish C use D put
10 .Which of the following is NOT meant in the last two paragraphs?
A Graphene is made of graphite, one of the softest materials in the world. B Graphite is made of layers of graphene, the thinnest material in the world. C When we get to the thinnest possible layer of graphite, we find graphene. D With a pencil, a sheet of paper and a piece of adhesive tape, we can ...
