Question

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 / nanoelectromechanical 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（半導(dǎo)體）．Kwon’s battery uses a liquid semiconductor 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（晶體結(jié)構(gòu)） 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．

1.Jae Kwon gave examples in Paragraph 4_________．

A．to show chemical batteries are widely applied．

B．to introduce nuclear batteries can be safely used．

C．to describe a nuclear-powered system．

D．to introduce various energy sources．

2.According to Jae Kwon, his nuclear battery _______．

A．uses a solid semiconductor

B．will soon replace the present ones．

C．could be extremely thin

D．has passed the final test．

3.The text is most probably a ________．

A．science news report B．book review

C．newspaper ad D．science fiction

 

Answer 1

1.B

2.C

3.A

【解析】

試題分析：文章大意：本文介紹了新型的核技術(shù)的電池的發(fā)展，這種電池體積更小，能量更大。

1.判斷題。根據(jù)本段nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems．”說(shuō)明現(xiàn)在的技術(shù)已經(jīng)很完美，安全性能也很高，說(shuō)明主語(yǔ)的電池可以被安全地使用，故B正確。

2.理解題。根據(jù)文章最后一句Kwon said that battery could be thinner than the thickness of human hair．說(shuō)明這樣的電池可能會(huì)非常thin。故C項(xiàng)正確。

3.判斷題。本文是關(guān)于新型的電池的研究，其中涉及到高科技的核技術(shù)，那么最有可能是從科技報(bào)告中取出來(lái)的，故A正確。

考點(diǎn)：考查科普類(lèi)短文閱讀