高考英语二轮复习 专题三 阅读理解之科技类(3) 专题学案 新人教版

专题三 阅读理解之科技类(3) (新课标) 三、科技类 【典例探究】 (2010· 山东卷· D) Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient. “To provide enough power, we need certain methods with high energy density(密度)”,said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.” Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro/nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe. “People hear the word ?nuclear? and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.” His new idea is not only in the battery?s size, but also in its semiconductor(半导体). Kwon?s battery uses a liquid semiconducto r rather than a solid semiconductor. “The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.” Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery?s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair. 【文章大意】本篇为科普短文,介绍由美国密苏里大学研究者所开发的核能电池的情况。 71. Which of the following is true of Jae Kwon? A. He teaches chemistry at MU. B. He developed a chemical battery. C. He is working on a nuclear energy source. D. He made a breakthrough in computer engineering. 用心 爱心 专心 1 72. Jae Kwon gave examples in Paragraph 4_________. A. to show chemical batteries are widely applied. C. to describe a nuclear-powered system. 73. Liquid semiconductor is used to _________. A. get rid of the radioactive waste C. decrease the size of nuclear batteries B. test the po

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