According to the second and third paragraphs, what is true of graphene?
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1 .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...
2 .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
3 .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.
4 .According to the last two paragraphs, what did the previous researchers think about the human eye's 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.
5 .What would change the future of electronics according to engineers?
A Big technology. B Creative ways. C Graphene. D Both A and B.
7 .Which of the following can be used to replace the word “apply” in paragraph4?
A request B polish C use D put
8 .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 ...
9 .Graphene's superstrength lies in the fact that .
A It is the thinnest material in the world. B It is made of the most abundant elements in the world. C It can help to make electronic components smaller. D It helps engineers to produce more sensitive electronic products.
10 .Why did the writer want to leave the hotel?
A To enjoy the good weather. B To have a change of scene. C To spend all his winnings. D To get away from the crew.
