题目内容
_________ the solid rock on Manhattan Island it is safe to build very tall buildings there.
[ ]
A. Since B. As C. Because D. Because of
阅读快车系列答案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.
【小题1】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. |
| 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. |
| A．get rid of the radioactive waste | B．test the power of nuclear batteries. |
| C．decrease the size of nuclear batteries | D．reduce the damage to lattice structure. |
| A．uses a solid semiconductor | B．will soon replace the present ones. |
| C．could be extremely thin | D．has passed the final test. |
| A．science news report | B．book review |
| C．newspaper ad | D．science fiction story |
IV.信息匹配(5×2)
| A．Reading time Bring your book to the appointed place at noon. You can exchange books with other people there. It is a good idea to write your personal information on the cover of the book, as you can make friends in this way. |
| B．Use old books to get free coffee You can get free coffee if you exchange four English or Chinese books or 10 English or Chinese magazines. “The magazines and books might be old, but the emotion, inspiration and happiness contained within them can be shared with many people.” said Zhuang Songlie, the leader of activity. |
| C．Listen to book With 260 seats, this is the biggest story-telling theatre in Beijing. Young story-teller, Li Jing and Wang Yuebo, will be telling stories in a tea house. With delicious snacks and tea provide, you can enjoy the stories comfortably. |
| D．Eat book |
E. Read book, protect yourself
Summer time is the prefect season for pretty girl, but it is also a peak time for attackers in the street. These books teach you how to protect yourself. All the books are free for women to read. Some policewomen will show you how to use some devices, such as a pocket-knife and a cellphone-like gun, to protect yourself.
F. Read , free ticket
Enjoy the humor alone, or share your humorous stories with others? Are you a good story reader? Stand on the stage ,share your humor, and spend a happy Sunday evening. Every reader will get a free ticket to the movie:The Love Duru
1.Mike, an 18-year-old boy, is eager to find a place where he can exchange books with others. He hopes to make friends with people who like reading.
2.Angela likes novels very much, especially humorous ones. She also wants to see the films.
3. Tom is ten years old. He doesn’t like reading, so every time his mother asks him to read, he says, “If the book is as good as chocolate, then I will read it.”
4.Joan hopes to buy something to protect herself. She has heard that there are some special tools to deal with attackers. She wants to know more about them.
5. Oleven wants to experience traditional Chinese story telling. Before she came to Beijing, she had learnt something about tea houses, where people can listen to stories and drink tea.