To make electrochromic windows change color, what is applied to the window glass?
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1 .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.
2 .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.
3 .Which of the followings does not indicate the importance of windows as described in the first two paragraphs?
A Windows can change from clear to dark to save energy. B Windows help to save energy by letting light in. C Windows help to save energy by providing heat. D Windows enable people to have contact with the outside world.
4 .When are windows the weak link in a building?
A in the cold winter B in the hot summer C when air conditioners are turned on D both A and B
5 .What are the smart windows, according to P4?
A Windows that are coated. B Windows that are glazed. C Windows the color of which can be changed. D Windows that have many layers.
7 .What will be the benefit if the research on smart windows turns out to be successful, according to the last paragraph?
A The buildings will look different. B Windows can be as large as you want. C We may not need air conditioners any more. D They are less expensive than traditional windows.
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9 .(47)_______
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10 .(48)_______
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