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 题目和参考答案——青夏教育精英家教网—

精英家教网 > 高中英语 > 题目详情

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 bat

tery. 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 thic

kness of human hair.
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.
2. 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.
3. Liquid semiconductor is used to _________.
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.
4. According to Jae Kwon, his nuclear battery _______.
A. uses a solid semiconductor
B. will soon replace the present ones.
C. cou

ld be extremely thin
D. has passed the final test.
5. The text is most probably a ________.
A. science news report        B. book review
C. newspaper ad              D. science fiction story

小题1:C
小题2:B
小题3:D
小题4:C
小题5:A

略

练习册系列答案

年级	高中课程	年级	初中课程
高一	高一免费课程推荐！	初一	初一免费课程推荐！
高二	高二免费课程推荐！	初二	初二免费课程推荐！
高三	高三免费课程推荐！	初三	初三免费课程推荐！
更多初中、高中辅导课程推荐,点击进入>>

相关习题

科目：高中英语 来源：不详 题型：阅读理解

Do you want to live another 100 years or more? Some experts say that scientific advances will one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.
“ I think we are knocking at the door of immortality (永生),” said Michael Zey, a Montclair State University business professor and author of two books on the future. “ I think by 2075 we will see it and that’s a conservative estimate.”
At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology(纳米技术) make it likely that humans will live in the future beyond what has been possible in the past. “ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”
However, many scientists who specialize in aging are doubtful about it and say the human body is just not designed to last about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.
Scientists also differ on what kind of life the super aged might live. “ It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life?” said Leonard Poon, director of the University of Georgia Gerontology Center. “ At present people who could get to that point are not in good health at all.”
小题1:By saying “ we are knocking at the door immortality”, Michael Zey means_____.

A．they believe that there is no limit of living

B．they are sure to find the truth about long living

C．they have got some ideas about living forever

D．they are able to make people live past the present life span

小题2:Donald Louria’s attitude toward long living is that_____.

A．people can live from 120 to 180

B．it is still doubtful how long humans can live

C．the human body is designed to last about 120 years

D．it is possible for humans to live longer in the future

小题3:70. The underlined “ it” (Para. 4) refers to_____.

A．a great push

B．the idea of living beyond the present life span

C．the idea of living from 200 to 300

D．the conservative estimate

小题4:What would be the best title for this text?

A．Living longer or not

B．Science, technology and long living

C．No limit for human life

D．Healthy lifestyle and long living.

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

　In a great many cities, hundreds of people ride bicycles to work everyday. In New City, some bike riders have even formed a group called Bike for a Better City. They declare that if more people rode bicycles to work, there would be fewer automobiles(汽车) in the downtown part of the city and so less dirty air from car engines. For several years this group has been trying to get the city government to help bicycle riders. For example. They want the city to draw special lanes(通道) for bicycles only on some of the main streets, because when bicycle riders must use the same lanes as cars, there are accidents. Bike for a Better city feels that if there were special lanes more people would use bikes.
But no bicycles lanes have been drawn. Not everyone thinks they are a good idea-----they say it will slow traffic. Some store owners on the main streets don't like the idea------they say that if there is less traffic, they will have less business.
The city government has not yet decided what to do. It wants to keep everyone happy. On weekends, Central Park----the largest place of open ground in New York----is closed to cars, and the roads may be used by bicycles only. But Bike for a Better City says that this is not enough and keeps fighting to get bicycle lanes downtown.
73. The bike riders suggest that _____________.
A. bicycles should be used instead of cars    B. bicycle lanes should be drawn
C. fewer buses or cars should be used  D. the number of special lanes should be increased
74. The advantage(好处) of the special lanes is that _______.
A. they will make cars and buses run slowly   B. they will make it easier for bike riders to go to parks
C .they will make the city more beautiful    D. the lanes will prevent accidents
75. The government has not decided whether special lanes should be drawn ______.
A. so that everyone is disappointed      B. because there are different opinions
C. because most people travel by train   D. because Bike for a Better City is not strong enough

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

E
After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the day. The rest that you get while sleeping makes it possible for your body to prepare itself for the next day.
There are four levels of sleep, each being a little deeper than the one before. As you sleep, your body relaxes little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts(变换) back and forth from one level to the other.
Although your mind slows down, you will dream from time to time. Scientists who study sleep point out that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
If you have trouble falling asleep, some people recommend(建议) breathing very slowly and very deeply. Other people believe that drinking warm milk will make you drowsy. There is also an old suggestion that counting sheep will put you to sleep.
49. During REM, ______
A. you move restless                                         B. you start dreaming
C. your mind stops working                                         D. your eyeballs move quickly
50. A good title for this text might be_________
A. Dreams                     B. Sleep                C. Good Health      D. Work and Rest

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

American and British researchers have proved that judgments based on how someone looks are important. They found that appearance tells a lot about your personality.
The researchers included Laura Naumann of Sonoma State University in California, and Simine Vazire of Washington University in Saint Louis, Missouri. They were joined by Sam Gosling of the University of Texas at Austin and Peter J. Rentfrow of Britain's Cambridge University. The results of their study were published in the Personality and Social Psychology Bulletin in December, 2009.
The subjects（接受实验者）were asked to judge the personality of people the

y had never met. The judges examined pictures of one hundred twenty-three people. The people in the photographs had been told how to stand. They looked into the cameras without showing their feelings. The same people also were photographed the way they themselves wanted to stand. Those who wanted to smile could smile.
Then the judges attempted to decide what the people were like. The researchers compared the judges’ opinions with the way the people who were photographed thought of themselves. Three people who knew those in the photographs well also provided information about their personality and behavior.
The judges looked for ten qualities in the people in the pictures. The qualities included extroversion (having a confident character and enjoying the company of other people) and self-esteem (being satisfied with oneself).
The judges also l

ooked for signs of loneliness, conscientiousness（正义）, emotional control and religious and political beliefs.
The researchers said the judges could identify some personalities even when people were pictured in controlled positions. They could recognize personalities like extroversion and self-esteem. But it was hard for the judges to decide about most other personalities under the controlled conditions.
When the people smiled and stood naturally, however, judging their personalities was easy. Then the judges’ choices were correct for nine of the ten personalities.
Researcher Laura Nauman said that we live in the world where first impressions are important.
1. According to the passage, who were the judges?
A. The researchers of the study.                       B. The subjects in the study.
C. Parents and other adults.                               D. People in the photographs.
2. Which of the following qualities could the judges identify even when people were pictured in controlled positions?
A. Extroversion                   B. Religious beliefs              C. Loneliness         D. Emotional control
3. We can infer

from the passage that ____________
A. the study was carried out by four researchers from America.
B. in the study126 people were photographed for judges to decide their personalities.
C. the Personality and Social Psychology Bulletin is an official publication（出版物）.
D. it was

hard to recognize personalities when the people were pictured with natural looks.
4. What will the author most probably talk about next?
A. The quality of the judges. B. The personalities of Laura Nauman.
C. Signs of emotional control. D. The reason why one’s appearance is important.

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

第三部分：阅读理解（共20小题；每小题2分，满分40分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题
卡上将该项涂黑。
The 2009 outbreak of HINI is a new kind of influenza virus, commonly referred to as “swine flu”. It is thought to be a break of four known kinds of influenza. A virus subtype H1N1: one endedmic(流行病) in humans, one endemic in birds, and two endemic in pigs (swine). The source of the outbreak in humans is still unknown, but cases were first discovered in the U.S. and soon after in Mexico.
According to the U.S. Centers for Disease Control and Prevention(CDC)，it is not yet clear how serious this new virus actually is compared with other influenza viruses, although on May 26 they stated that new cases in the U.S. have probably reached the hightest point, and most cases have so far been mild relative to “seasonal flus”. But because this is a new virus, most people will not have immunity(免疫性) to it, and illness may eventually become more severe and widspread. The H1N1 flu mainly spreads in the same way that regular “seasonal influenza” spreads through the air from coughs and sneezes or touching those infected. It cannot be transmitted from eating cooked pork or by being in close contact with pigs.
As yet there is no vaccine(疫苗) available to prevent infection although companies are in the planning stages for having one available later this year. But there is concern that the virus could vary again over the coming months, leading to a new and potentially more dangerous flu outbreak later in the year, and a vaccine that will be less effective in preventing its spread.
As of May 27, the virus had spread to more than 50 countries; however, over 80% of reported deaths have taken place in Mexico. According to the CDC, the fact that the flu’s infection activity is now monitored more closely may help explain why more flu cases than normal are being recorded in Mexico, the United States and other countries.
1. The 2009 outbreak of H1N1 is thought to      .
A.be concerned with four endmics
B.have come from the virus from pigs
C.occur because of unknown virus in Mexico
D.be caused because of people without immunity
2.According to the U.S. Centers for Disease Control and Prevention, ______.
A.most people won’t be infected with the flu
B.the H1N1 will not be too mild to cause many deaths in the world
C.the present situation allows of no optimist
D.H1N1 can be transmitted by touching pigs
3.To make people worried more is that      .
A.no effective vaccine can prevent the virus from spreading
B.the virus will mutate in the following months
C.a seasonal influenza will break out
D.the newly-developed vaccine will lose effectiveness
4.From the passage we can learn that      .
A.every country is watching closely the spreading of the H1N1
B.more than one-fourth of the deaths from the H1N1 are in Mexico
C.only the United States and Mexico recorded the cased of influenza
D.effective medicine has been produced to cure the H1N1

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

Increasing affluence（富裕）and currency appreciation are behind the spike in Chinese students traveling abroad for their undergraduate studies, industry insiders said.
The Ministry of Education last month reported that a record 840,000 high school graduates did not register for the gaokao (university entrance exam) this year. Those numbers are fueling speculation that this was due to the increasing number of Chinese students wanting to study abroad.
The total number of students traveling abroad to study increased from 144,000 in 2007 to 170,000 last year. This figure will probably top 200,000 this year, said Feng Jishang, marketing manager of Wiseway, a consulting firm that advises students and their parents about overseas schools.
Years ago, most Chinese students who went abroad would first complete their undergraduate studies in China before applying to an overseas graduate school. But this traned is changing. According to industry estimates, the proportion of students seeking their first degree abroad has risen to 30 to 50 percent of all overseas-bound students. That means there could be as many as 60,000 to 100,000 such students this year—— triple the number in 2003.
Foreign college campuses are beginning to notice the trend. A source tat the University of San Francisco told China Business Weekly that the campus used to accept three or four Chinese undergraduate students every year. Today, the number has hit 80, the university source said.
Rapid economic growth, coupled with a currency that has risen by more than 20 percent against the US dollar over the last four years, is making an overseas education more affordable for Chinese students. That’s making US campuses such as the University of San Francisco, or USF, more of a bargain. “ Students used to tell me that they did not have the money to go to USF, and they needed full scholarships. That is not the case now,” said Stanley Nel, vice-president of international relations at the San Francisco campus.
Another reason is that there simply aren’t enough places in Chinese colleges, especially the higher-rated ones, to satisfy the demand for a university education. “ Four in ten students taking the gaokao won’t get university places. Furthermore, of those that do many don’t get into the schools of their choice. That is why more are going abroad,” Feng of Wiseway said.
A widespread perception among students is that going overseas for college improves their career prospects, sources said. “ For Chinese students, capability is not a problem, but they need work experience and communication skills,” said Alan McNeilly, assistant dean at Teeside University in the United Kingdom. “ If they get a degree overseas, they can expect higher salaries and better positions when they return,” McNeilly said. His university will set up an office in China next month to attract more students, Mc Neilly added.
1.More and more Chinese students have recently traveled abroad for studines because______.
A．they don’t want to take part in the gaokao
B．most Chinese students want to study abroad
C．many Chinese people become richer and US dollar has been devalued
D．it is easy to complete their undergraduate studies
2.Which of the following statistics-related statements is NOT true?
A．The number of students seeking their first degree abroad is around 20,000 to 33,000 in 2003.
B．The increment of the total number of students traveling abroad to study is probably bigger from 2008 to 2009 than that from 2007to 2008.
C．The number of Chinese undergraduate students accepted at USF is about 20 to 26 times of that in the past.
D．200,000 out of the 840,000 high school graduates who did not take the gaokao this year started their undergraduate study abroad.
3.Students interested in studying abroad take the following factors into account EXCEPT_____.
A．financial affordability
B．work opportunities after graduation
C．accommodation standard
D．the chance of getting into a more desirable university
4.What can be inferred from this passage?
A．If the Chinese RMB decreases 20 percent against the US dollar, the number of Chinese students traveling abroad to study will decrease 20 percent.
B．If more universities are established in China, fewer students will choose to study abroad.
C．Teeside University will set up an office in China to attract those students who have been admitted to USF but have not been offered full scholarships.
D．Without a degree overseas higher salaries and better positions are not impossible if you are experienced and have outstanding communication skills.

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

The best way to improve your reading ability is, of course, to read. The student must make a real effort to improve his speed, and if necessary his comprehension, with each exercise. Too many students read passages passively（被动的） and without judgment: they simply start at the first word and read through to the end. You should read a passage actively, selectively（选择地） and purposely. You must believe that you indeed have the ability to read faster and understand, and that you will.
Reading, like everything else in life, is best done when you’re relaxed. The key to improve it is concentration. You must be willing to break some old habits and form new ones. Extra body movement, such as turning the head from side to side, pointing at the line with a finger or pencil, or moving the lips, should be stopped immediately. Reading is mostly a mental process(大脑活动过程) and body movement helps neither speed nor comprehension. Then you should see words as part of a whole sentence or paragraph, not just in isolation(孤立), This is why a slow, word-by-word student often understands far less, or misses much of the joy and excitement of reading.
The student must learn to improve reading skills on their own, and not just when a teacher is looking over his shoulder. Reading improvement takes discipline（纪律） and effort. Don’t give up.
1. According to the author, how should we not read a passage?
A. actively        B passively.   C. purposely        D. selectively
2. You may conclude that whether you can improve your reading depends on________.
A. your attitude                      B. your good habits of reading
C. discipline                         D. all of the above
3. Which of the following is true according to the passage?
A. When reading, you’d better point at the line with a pencil. 　　
B. When reading, you should turn your head from side to side.
C. When reading, you should pay attention to basic unit of meaning, that is a phrase or sentence that contains an idea.
D. Body movement will help you to improve reading.
4. The best title for this passage is___________.
A. Reading Faster                         B. Understanding Better
C. How to Improve Your Reading             D. Don’t Give Up

查看答案和解析>>

科目：高中英语 来源：不详 题型：阅读理解

.
Do you want to live another 100 years or more? Some experts say that scientific advances will
one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.
“ I think we are knocking at the door of immortality (永生),” said Michael Zey, a Montclair State University business professor and author of two books on the future. “ I think by 2075 we will see it and that’s a conservative estimate.”
At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology(纳米技术) make it likely that humans will live in the future beyond what has been possible in the past. “ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”
However, many scientists who specialize in aging are doubtful about it and say the human body is just not designed to last about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.
Scientists also differ on what kind of life the super aged might live. “ It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life?” said Leonard Poon, director of the University of Georgia Gerontology Center. “ At present people who could get to that point are not in good health at all.”
67. By saying “ we are knocking at the door immortality”, Michael Zey means_____.
A. they believe that there is no limit of living
B. they are sure to find the truth about long living
C. they have got some ideas about living forever
D. they are able to make people live past the present life span
68. Donald Louria’s attitude toward long living is that_____.
A. people can live from 120 to 180
B. it is still doubtful how long humans can live
C. the human body is designed to last about 120 years
D. it is possible for humans to live longer in the future
69. The underlined “ it” (Para. 4) refers to_____.
A. a great push
B. the idea of living beyond the present life span
C. the idea of living from 200 to 300
D. the conservative estimate
70. What would be the best title for this text?
A. Living longer or not
B. Science, technology and long living
C. No limit for human life
D. Healthy lifestyle and long living

查看答案和解析>>

同步练习册答案

练习册

高中

初中

小学