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 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.

1.Which of the following is true of Jae Kwon?

2. Jae Kwon gave examples in Paragraph 4_________.

3.Liquid semiconductor is used to _________.

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

5.The text is most probably a ________.

基础写作（15分）

【写作内容】

“无车日”(Car-free Day)是一项节能环保的活动，下面请你介绍活动有关情况，并号召更多的城市和居民参与到该活动中来。

活动背景：随着经济的发展，更多家庭拥有私家车，造成严重的交通问题和环境污染。

活动时间：每年9月22日       

参 与 者： 全国108个城市

活动目的：提高人们节约能源与保护环境的意识

活动内容：倡议人们选用公共汽车、自行车或步行方式

活动效果：得到全国人民的支持, 取得巨大成功

【写作要求】                            

只能用5个句子表达要表达的内容。

【评分标准】

句子结构准确；信息内容完整；篇章结构连贯。

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Because of _______ high demand for Type O blood, _______ supplies of it available in blood banks are usually limited.

A. a; the                B. the; the     C. /; the               D. /; /

Many people agree that there has never been a more splendid opening ceremony than _______ of the Guangzhou Asian Games in history.

A. one               B. that         C. which                D. this

My uncle now teaches French in a famous domestic university, who _______ in Paris for 6 years.

A. have lived            B. had lived        C. was living           D. lived

— Bad luck. They didn’t offer the job to me.

—_______ You’ve been well prepared for the interview.

A. So what?          B. What if?     C. How come?            D. Guess what?

_______ difficult the task may be, we must finish it on time, because we can’t miss _______ a precious opportunity．

A. Whatever; so           B. However; such    C. However; so      D. Whatever, such

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.

A. are; when            B. is; when         C. is; while            D. are; as

— How long do you think it will be _______ the USA recovers from the losses of the financial crisis?

   — Perhaps four or five years.

   A. when                  B. since       C. that             D. before

What a table! I’ve never seen such a thing before. It is _______ it is long.

   A. not half as wide as                       B. wide not as half as

   C. half not as wide as                       D. as wide as not half