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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 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.
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.

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.

The text is most probably a ________.

A.science news report B.book review
C.newspaper ad D.science fiction
科目 英语   题型 阅读理解   难度 中等
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相关试题

C
Of all the websites,one that has attracted attention recently is myspace.com.Most of this attention has come from the media and tells every reason why the website should be shut down.The threat of internet predators(窃掠者)is indeed a tough reality,but shutting down the site is not the answer.If myspace.com were shut down,another site would quickly take its place.Therefore,the right way is to teach teens how to use the site safely and educate them about who may be predators and how to avoid them.
The key to staying safe on the Internet is to make sure that your profile(个人资料)is secure.The simplest way is to change the privacy setting on your profile to “private”, which protects your information so that only the people on your friend list can view it.Although this is effective,it is not perfect.Predators can find ways to view your profile if they really want to,whether through hacking in or figuring out their way onto your friend list.Thus,you should never post too much personal information.Some people actually post their home and school addresses,date of birth,and other personal information, often letting predators know exactly where they will be and when.The most information that is safe is your first name and province.Anything more is basically inviting a predator into your life.
Another big issue is photos. I suggest completely skipping photos and never posting a photo of a friend online without asking permission.
Most importantly, never,under any circumstances,agree to a real-life meeting with anyone you meet online.No matter how well you think you know this person, there are no guarantees that they have told the truth.But you could feel free to chat with people you meet on the site, but just remember that not everyone is who they say they are.Hopefully,the next time you edit your profile,you’ll be more informed about the dangers of internet predators and take the steps to defend yourself.
50.Kids can avoid web predators successfully by_________.
A.attracting more public attention
B.shutting down the website “myspace . com”
C.showing the kids ways to try other sites
D.recognizing and getting away from them
51.The safest basic personal information that you can share online is_________.
A.your home address and birthday B.school address and your first name
C.your first name and province D.your province and cell phone number
52.We can learn from the passage that_____.
A.not everybody you meet on line is honest and reliable
B.it is not acceptable to post a photo of a friend on line
C.it is not safe by chatting with grown-ups on the website
D.only you and your friends can view your personal profile
53.What could be the best title of this passage?
A.Personal Safety B.Web Safety for teens
C.Web Hackers in the pastD.Predators’ Tricks

B
Science isn’t something mysterious, only for the few. Every one of us—whether a poet, worker, or physicist has to be able to think scientifically, and to understand some science, such as whether to smoke, what to eat, and what protection to use. Even for decisions that don’t depend on some scientific facts, science remains the proven set of best methods for getting exact information about the world.
Some people will end up as policy-makers in government or business. People such as these make decisions that affect the life of everyone, and most of them know no more about science than does the rest of the general public. Yet they are called upon to decide what to do about nuclear reactors(核反应堆), global warming, environmental toxins(环境霉素), expensive space programs, and biomedical research. It’s nonscientists, not scientists, who have the last word on whether the milk we drink can safely come from cows treated with medicine. To make such decisions wisely, the decision makers have to be drawn from a scientifically educated public.
Even if science is irrelevant(不相干的) to the lives of ordinary Americans, a strong scientific spirit is basic to our economy, educational system, and society. This requires lots of young people to become excited enough by science that they decide to become professional scientists. This also requires, to some degree, the support and understanding of the general public.
Scientists are not always able to communicate their findings in an easy-to-understand manner. Although the scientists should do a better job of explaining what they have discovered, members of the general public have to make efforts to understand what is being said.
46.What does the author mean by saying that “a strong scientific spirit is basic to the economy, educational system and society”?
A.School and society should encourage young people to become professional scientists.
B.The school should only teach lessons of economy and education·
C.A scientifically educated public is basic to the economy,educational system and society.
D.More scientists work in our economy, educational system and society.
47.The general public is required to _______.
A.support and understand the need of scientific education
B.check what the scientists are saying
C.give help to the policy-makers
D.become professional scientists
48.The main idea of this passage is _________.
A.policy—makers must be science professionals
B.science is not far from everyone’s life
C.science has nothing to do with ordinary Americans
D.science professionals make decisions that affect the life of everyone
49.According to the passage, who can decide whether the milk we drink can safely come from
cows treated with medicine?
A.Scientists B.Young people C.The public D.Policy-makers

三、阅读理解(共20小题;每小题2分,满分40分)
A
What exactly is a lie? Is it anything we say which we know is untrue? Or is it something more than that? For example, suppose a friend wants to borrow some money from you. You say, "I wish I could help you but I'm short of money myself." In fact you are not short of money but your friend is in the habit of not paying his debts and you don't want to hurt his feelings by reminding him of this. Is this really a lie?
Professor Gerald Gullion of the University of Southern California has made a scientific study of lying. According to him, women are better liars than men, particularly when telling a "white lie", such as a woman at a party telling another woman that she likes her dress when she really thinks it looks awful. However, this is only one side of the story. Other researchers say that men are more likely to tell more serious lies, such as making a promise which they have no intention of fulfilling. This is the kind of lie politicians and businessmen are supposed to be particularly skilled at: the lie from which the liars hopes to profit or gain in some way.
Research has also been done into the changes of people’s behavior in a number of small, clearly unimportant ways when they lie. It has been found that if they are sitting down at the time, they tend to move about in their chairs more than usual. To the trained observer they are saying “I wish I were somewhere else now”. They also tend to touch certain parts of the face more often, in particular the nose. One explanation of this may be that lying causes a slight increase in blood pressure. The nose is very sensitive to such changes and the increased pressure makes it itch (痒).
Another gesture which gives away is what the writer Desmond Morris in his book Man Watching calls “the mouth cover”. He says there are several typical forms of this, such as covering part of the mouth with fingers, touching the upper-lip or putting a finger of the hand at one side of the mouth. Such a gesture can be understood, as an unconscious attempt on the part of the liar to stop himself or herself from lying.
Of course, such gestures as rubbing the nose or covering the mouth, or moving about in a chair cannot be taken as proof that the speaker is lying. They simply tend to occur more frequently in this situation. It is not one gesture alone that gives the liar away but a whole number of things, and in particular the context in which the lie is told.
41.According to the passage, a “white lie” seems to be a lie _______.
A.that other people have interest in
B.that other people cannot believe
C.told in order to avoid offending(冒犯) someone
D.told in order to take advantage of someone
42.Research suggests that women _______.
A.are better at telling lies than men do B.generally lie far more than men
C.often make promises they later break D.lie at parties more often than men do
43.Researchers find that when a person tells lies.
A.his or her blood pressure increases greatly
B.he or she looks very serious and moves about more
C.he or she tends to make small changes in his behavior
D.he or she uses his unconscious mind
44.One reason people sometimes rub their noses when they lie is that_______
A.1ying causes a slight increase in blood pressure
B.the nose is sensitive to physical changes caused by lying
C.they want to cover their mouths
D.they are trying to stop themselves from telling lies
45.Which of the following may best betray (出卖) a liar?
A.The touching of the tip of one’s nose. B.The change of one’s behavior.
C.“The mouth cover” gesture. D.The situations in which his lies are told.

C
Very few people were coming to eat at the White Rose Restaurant and its owner did not know what to do . The food in its restaurant was cheap and good , but nobody seem to want to eat there .Then he did something that changed all that , and in a few weeks his restaurant was always full of men with their lady friends .Whenever a gentleman came in with a lady , a smiling waiter gave each of them a beautiful menu . The menu looked exactly the same on the outside , but there was an important difference inside . The menu that the waiter gave to the men gave the correct price for each dish and each bottle of wine , while the menu that he gave to the lady gave a much higher price . So when the man calmly ordered dish after dish and wine after wine , the lady thought he was much more generous than he really was .
54. How was the food in the White Rose Restaurant?___________ .
A. Its quality had always been good and its price low
B. It was poor and expensive at first and became much better and less expensive later
C. It was cheap and good at the beginning but became more expensive later
D. It looked beautiful on the outside but it was became more different inside
55. How did the restaurant attract so many people?______________ .
A. By lowering the price of its food
B. By improving the quality of its food
C. With waiters smiling at the guests when they came into the restaurant and giving them better service while they are
D. By showing men and women menus with different price on them
56. According to this passage , when a man and a woman ate at the restaurant the food was paid by whom ?_____________ .
A. Usually by the man and sometimes by the woman
B. Always by the man only
C. Sometimes by the man only and sometimes by both of the man and the woman
D. Normally by the woman
57. The White Rose succeeded because__________ .
A. women liked their men friends to be generous
B. men liked their women friends to be generous
C. men were more generous than women
D. women were more generous than men

B
Hi, everybody !
Welcome to our newly-opened Richards Cinema Bookstore!
Now let me introduce to you some of the new film books in our store.
Are you Chinese film fans? OK, here comes the latest 25 New Takes about Chinese films. It is a collection of 25 fresh readings of different Chinese films from the 1930s to the present. In recent years, Chinese films are very popular in the States, such as Crouching Tiger and Hidden Dragon, Hero, and Flowers of Shanghai.
Do you like French films? Well, here is The French Cinema Book. It covers French films from the 1890s to the beginning of the 21st century. It is written for all lovers of French cinema: students and teachers, specialists and fans, and so on.
Maybe you are Indian film fans and star-chasers. Then here is Encyclopedia ( 百科全书 ) of Indian Cinema. The book is a complete introduction to all the best Indian films. It also offers a full list of names of the famous and successful film stars in the past ten years. You know, the Indian film industry is the largest in the world after our Hollywood.
If you like British films, we have The British Cinema Book. It is a good review of British cinema. This book contains a good many nice pictures.
In our bookstore, you can also find books about Mexican, Japanese, Australian, German and Italian films.
Well, please help yourselves to some coffee or tea, and have a good time here!
50. The speaker of the passage is most probably _______
A. the author of 25 New Takes B. a tourist in the cinema bookstore
C. the manager of the cinema bookstore D. a reader of Encyclopedia of Indian Cinema
51. How many Asian countries does the speaker refer to when he talks about the film books?
A. Two. B. Three. C. Four. D. Nine.
52. Which of the following statements is NOT mentioned in the passage?
A. Indian cinema is second only to Hollywood.
B. The British Cinema Book includes a complete list of names of stars.
C. Crouching Tiger and Hidden Dragon is well received in the States.
D. The French Cinema Book covers over a century's French films.
53. The purpose of the speaker is_______.
A. to satisfy the customers' various tastes
B. to keep the authors in the cinema bookstore
C. to offer the tourists chances to meet the film stars
D. to take the readers into film producers

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