Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge1 technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch2. Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When its hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until its completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. 词汇： air conditioner 空调 jolt n. v. 震摇，颠簸，晃动 glaze v. 装玻璃，上釉 voltage n. 电压 注释： 2. anywhere in between with a flip of a switch：就在开或关的一霎那。 练习： A) Windows can change from clear to dark to save energy. C) Windows help to save energy by providing heat. 2. When are windows the weak link in a building? B) In the hot summer. D) Both A and B. A) Windows that are coated. C) Windows the color of which can be changed. 4. To make electrochromic windows change color, what is applied to the window glass? B) Tungsten oxide. D) A voltage. A) The buildings will look different. C) We may not need air conditioners any more. 答案与解析： 借助文章中的用词特点或文章开头的语句进一步了解这篇文章的主题： It took us a long time to figure out what a window really is, says Claes Granqvist. Hes a professor of solid-state physics at Uppsala University in Sweden3. Its contact with the outside world. You have to have visual contact with the surrounding world to feel well. So, windows and natural light are important for improving the way people feel when theyre stuck indoors. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. One important feature that makes a smart window so smart is that it has a sort of memory. All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. In the future, Granqvist says, our buildings may look different. 2.直接解题： A) Windows can change from clear to dark to save energy. C) Windows help to save energy by providing heat.联系)the outside world.
点击查看： 2020考研英语完型填空练习题及答案解析汇总 Section II Use of English Directions: Read the following text. Choose the best word(s) for each numbered blank and put your choice in the ANSWER SH...（查看全文）
点击查看： 2020考研英语完型填空练习题及答案解析汇总 Section II Use of English Read the following text. Choose the best word (s) for each numbered blank and mark [A], [B], [C] or [D] on ANSWER SHEET....（查看全文）
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otherwise 是个常用词，也是一个多义词。由于在不同的语境中，otherwise 的含义和用法有着很大的差异，以致不少学生在理解和使用它时经常出错。现将它的用法归纳如下，供大家学习时参考。 一、otherwise 用作连词，...（查看全文）