专题三 阅读理解之科技类（3）（新课标） <br />三、科技类 <br />【典例探究】 <br />（2010&middot;山东卷&middot;D） <br />Batteries can power anything from small sensors to large systems. While scientists are finding <br />ways to make them smaller but even more powerful, problems can arise when these batteries are <br />much larger and heavier than the devices themselves. University of Missouri(MU) researchers are <br />developing a nuclear energy source that is smaller, lighter and more efficient. <br />&ldquo;To provide enough power, we need certain methods with high energy density(密度)&rdquo;，said Jae <br />Kwon, assistant professor of electrical and computer engineering at MU. &ldquo;The radioisotope(放 <br />射性同位素) battery can provide power density that is much higher than chemical batteries.&rdquo; <br />Kwon and his research team have been working on building a small nuclear battery, presently <br />the size and thickness of a penny, intended to power various micro/nanoelectromechanreal systems <br />(M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe. <br />&ldquo;People hear the word ‘nuclear’ and think of something very dangerous,&rdquo; he said, &ldquo;However, <br />nuclear power sources have already been safely powering a variety of devices, such as pace-makers, <br />space satellites and underwater systems.&rdquo; <br />His new idea is not only in the battery’s size, but also in its semiconductor(半导体). <br />Kwon’s battery uses a liquid semiconducto r rather than a solid semiconductor. <br />&ldquo;The key part of using a radioactive battery is that when you harvest the energy, part of <br />the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,&rdquo; <br />Kwon said, &ldquo;By using a liquid semiconductor, we believe we can minimize that problem.&rdquo; <br />Together with J. David Robertson, chemistry professor and associate director of the MU Research <br />Reactor, Kwon is working to build and test the battery. In the future, they hope to increase <br />the battery’s power, shrink its size and try with various other materials. Kwon said that battery <br />could be thinner than the thickness of human hair. <br />【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。 <br />71. Which of the following is true of Jae Kwon? <br />A. He teaches chemistry at MU. B. He developed a chemical battery. <br />C. He is working on a nuclear energy source. <br />D. He made a breakthrough in computer engineering. <br />72. Jae Kwon gave examples in Paragraph 4_________. <br />A. to show chemical batteries are widely applied. B. to introduce nuclear batteries can be <br />safely used. <br />C. to describe a nuclear-powered system. D. to introduce various energy sources. <br />73. Liquid semiconductor is used to _________. <br />A. get rid of the radioactive waste B. test the power of nuclear batteries. <br />C. decrease the size of nuclear batteries D. reduce the damage to lattice structure. <br />74. According to Jae Kwon, his nuclear battery _______. <br />A. uses a solid semiconductor ...