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（晶體結構） 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

【答案】

1.B

2.C

3.A

【解析】

試題分析：本文介紹了新型的核技術的電池的發展，這種電池體積更小，能量更大。

1.B 推理題。根據本段nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems．”說明現在的技術已經很完美，安全性能也很高，說明主語的電池可以被安全地使用，故B正確。

2.C 細節題。根據文章最后一句Kwon said that battery could be thinner than the thickness of human hair．說明這樣的電池可能會非常thin。故C項正確。

3.A 推理題。本文是關于新型的電池的研究，其中涉及到高科技的核技術，那么最有可能是從科技報告中取出來的，故A正確。

考點：考查科普類短文閱讀

點評：文中涉及的是核技術運用于電池方面的信息。屬于科普類短文，此類文章的最大的障礙是詞匯以及考生對閱讀內容的不熟悉，需要考生在閱讀的時候有足夠的耐心。要養成在上下文串聯中猜測詞義的能力，根據上下文中出現的同義詞，近義詞，反義詞，以及詞義的解釋來理解生詞。同時要抓住文章的中心，不要受其他信息的影響。要根據題目及選項以及文章的上下文串聯合理的判斷推理。