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(dǎo)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(jié)構(gòu)) 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.
小題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.
小題2:According to Jae Kwon, his nuclear battery _______.
A.uses a solid semiconductorB.will soon replace the present ones.
C.could be extremely thinD.has passed the final test.
小題3:The text is most probably a ________.
A.science news reportB.book review
C.newspaper adD.science fiction

小題1:B
小題2:C
小題3:A

試題分析:本文介紹了新型的核技術(shù)的電池的發(fā)展,這種電池體積更小,能量更大。
小題1:B 推理題。根據(jù)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(xiàn)在的技術(shù)已經(jīng)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。
小題2:C 細(xì)節(jié)題。根據(jù)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(huì)非常thin。故C項(xiàng)正確。
小題3:A 推理題。本文是關(guān)于新型的電池的研究,其中涉及到高科技的核技術(shù),那么最有可能是從科技報(bào)告中取出來的,故A正確。
點(diǎn)評(píng):文中涉及的是核技術(shù)運(yùn)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(duì)閱讀內(nèi)容的不熟悉,需要考生在閱讀的時(shí)候有足夠的耐心。要養(yǎng)成在上下文串聯(lián)中猜測(cè)詞義的能力,根據(jù)上下文中出現(xiàn)的同義詞,近義詞,反義詞,以及詞義的解釋來理解生詞。同時(shí)要抓住文章的中心,不要受其他信息的影響。要根據(jù)題目及選項(xiàng)以及文章的上下文串聯(lián)合理的判斷推理。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解

Have you heard of snake robots? Scientists and doctors are already using tiny snakes that coil through the human body armed with sharp surgical tools to perform operations on hearts, prostate cancer, and other diseased organs. The snake robots that carry tiny cameras, scissors and forceps, and even more advanced sensors are being developed.
The next generation of the robots will be wireless, and will explore inside your body on their own--- not attached to any cables. For now, they are powered by cables that humans control. Experts say the day is coming when some robots will roam around the body on their own. But the experts in robotics say the new creations work best when they are designed for very specific tasks.
Howie Choset has been researching and building robots, particularly snake robots. He believes that his snake robot and others like it can help reduce medical costs by making complex surgery faster and easier. Choset says his new design is smaller and more flexible than earlier models.
The size of surgical robots allows surgeons to operate with far less damage to the body, helping the patient heal faster. Choset has also built larger snake robots designed for search and rescue, or just exploration. They can climb poles and trees and then look around through a camera in the head and slither through places that humans cannot reach.
“ We sent our snake robots into these caves in the Red Sea to look for evidence of ancient Egyptian ships,” he said. “ To me, archeology is like search and rescue, but everyone has been dead for 5,000 years.”
The doctors are very excited about the potential for surgical robots to do things that humans can’t do. The variety of sensors available for surgical robots keeps expanding. As they get smaller, maybe one day they will be able to test chemicals or blood in the body, or even the electrical connections in nerves.
小題1:What can we learn from the first paragraph?
A.The doctors carry out surgery using snake robots mainly for heart disease.
B.The doctors are very satisfied with the new snake robots during surgery.
C.Snake robots are completely free of human control today.
D.Other supplementary appliances will be added to snake robots.
小題2:Which of the following is true, according to the passage?
A.Snake robots are only used in the medical field.
B.Snake robots can reduce the patients’ medical costs.
C.Scientists are uncertain about the prospects for snake robots.
D.Scientists are forced to spend a lot of time researching snake robots.
小題3:How can snake robots work best, according to the passage?
A.When they carry tiny cameras, scissors and forceps.
B.When they are operated by experienced doctors.
C.When they are given a wireless function.
D.When they are designed for particular tasks.
小題4:Why do we know about Howie Choset, according to the passage?
A.He thought snake robots of different sizes can be used for different types of surgery.
B.He thought patients’ pain had been slightly reduced with the help of snake robots.
C.He also made snake robots for search, rescue and exploration.
D.He is very interested in researching ancient Egyptian ships.
小題5:The writers attitude towards the new technology is ______.
A.optimisticB.doubtful C.objective D.negative

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

The common cold is the world's most widespread illness, which is a serious infection that man receives.
The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses passing on from person to person. You catch a cold by touching directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in separate Arctic (北極的)areas, explorers have reported being free from colds until touching again with infected people from the outside world by way of packages and mail dropped from airplanes.
During the First World War, soldiers who spent long periods in the trenches, cold and wet, seldom caught colds.
In the Second World War, prisoners at Auschwitz concentration camp, bare and starved, were astonished to find that they seldom had colds.
At the Common Cold Research Unit in England, volunteers took part in experiments in which they gave themselves to the discomforts of being cold and wet for a long time. After taking hot baths, they put on bathing suits, allowed themselves to be with cold water, and then stood about dripping wet in a room. Some wore wet socks all day while others exercised in the rain until close to exhaustion. Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.
If then, cold and wet have nothing to do with catching colds, why are they more frequent in winter? Despite the most hard research, no one has yet found out the answer. One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times, and that makes it easier for cold viruses to be passed on.
No one has yet found a cure for the cold. There are drugs and pain-killers such as aspirin, but all that they do is to reduce the symptoms.
小題1:The writer thinks the cause of catching cold is due to_______.
A.touching anyone directly
B.touching anyone indirectly
C.cold weather
D.getting viruses from person to person
小題2:Arctic explorers may catch colds when___.
A.they are working in the separate Arctic areas
B.they are writing reports in terribly cold weather
C.they are free from work in the isolated Arctic regions
D.they are coming into touch again with the outside world
小題3:Volunteers taking part in the experiments in the Common Cold Research Unit___.
A.suffered a lotB.never caught colds
C.often caught coldsD.became very strong
小題4:The passage mainly discusses___.
A.the experiments on the common cold
B.the mistake about the common cold
C.the reason and the way people catch colds
D.the continued spread of common colds

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

根據(jù)短文內(nèi)容,從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。
Doctors say anger can be an extremely damaging emotion, unless you learn how to deal with it. They warn that anger can lead to heart disease, stomach problems, headaches, emotional problems and possibly cancer.
___1___ Some people express anger openly in a calm reasonable way. Others burst with anger, and scream and yell. But other people keep their anger inside. They can not or will not express it. This is called repressing anger.
For years many doctors thought that repressing anger was more dangerous to a person’s health than expressing it. They said that when a person is angry, the brain releases the same hormones (荷爾蒙). They speed the heart rate, raise blood pressure, or sugar into the blood, etc. ___2___
Some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger violently may be more likely to develop heart disease, and they believe that those who keep anger inside may face a greater danger of high blood pressure.
___3___ They say the first step is to admit that you are angry and to recognize the real cause of the anger, then decide if the cause is serious enough to get angry about. If it is, they say, “___4___ Wait until your anger has cooled down and you are able to express yourself calmly and reasonably.”
Doctors say that a good way to deal with anger is to find humor in the situation that has made you angry. ___5___
A.In general the person feels excited and ready to act.
B.They said that laughter is much healthier than anger.
C.Expressing anger violently is more harmful than repressing it.
D.Do not express your anger while angry.
E. Anger may cause you a cancer.
F. Anger is a normal emotion that we all feel from time to time.
G. Doctors say the solution is learning how to deal with anger.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

___1____ Maybe you thought that they were just happy. After all, you probably sing or whistle when you are happy.
However, they sing most of the time for a very different reason. ____2___ Some scientists believe that birds do sing some of the time just because they are happy.
Do you know what a “territory” is? A territory is an area that an animal, usually the male, claims(聲稱)as its own. ____3___ No other families of the same species are welcome. Your yard and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten you, you might shout. Probably this would be enough to frighten him away. If so, you have actually scared the stranger away without having to fight him. A bird does the same thing. But he expects an outsider almost any time, especially at nesting(筑巢)season. So he is screaming all the time, whether he can see an outsider or not.__4__.
Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs. You can see that birds have a language all their own. ___5__
A.Only he and his family are welcome there.
B.Most of it has to do with attracting mates and setting up territories.
C.Have you ever wondered why birds sing?
D.Their singing is actually a warning to other birds to stay out of their territory.
E. Have you ever wondered why birds sing?
F. Most of the language is widely used.
G. This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

You never see them, but they're with you every time you fly. They record where you are going, how fast you're traveling and whether everything on your airplane is functioning normally. Their ability to withstand almost any disaster makes them seem like something out of a comic book. They're known as the black box.
When planes fall from the sky, as a Yemeni airliner did on its way to Comoros Islands in the India ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine (潛水艇) detected the device's homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first mode for a black box, which became a requirement on all U.S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane – the area least subject to(易遭受)impact – from its original position in the landing wells (起落架艙). The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
Modern airplanes have two black boxes: a voice recorder, which tracks pilots' conversations, and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft's final moments. Placed in an insulated (隔絕的) case and surrounded by a quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000℉. When submerged, they're also able to emit signals from depths of 20,000 ft.
Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1, 2009, are in water nearly that deep, but statistics say they're still likely to turn up. In the approximately 20 deep-sea crashes over the past 30 years, only one plane's black boxes were never recovered.
小題1:What information could be found from the black box on the Yemeni airliner?
A.Data for analyzing the cause of the crash.
B.The total number of passengers on board.
C.The scene of the crash and extent of the damage.
D.Homing signals sent by the pilot before the crash.
小題2:Why was the black box redesigned in 1965?
A.New materials became available by that time.
B.Too much space was needed for its installation.
C.The early models often got damaged in the crash.
D.The early models didn't provide the needed data.
小題3:Why did the Federal Aviation Authority require the black boxes be painted orange or yellow?
A.To distinguish them from the colour of the plane.
B.To caution people to handle them with care.
C.To make them easily identifiable.
D.To obey international standards
小題4:What do we know about the black boxes from Air France Flight 447?
A.There is still a good chance of their being recovered.
B.There is an urgent need for them to be reconstructed.
C.They have stopped sending homing signals.
D.They were destroyed somewhere near Brazil.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空

One day, a teacher was speaking to a group of students about how to manage time. He gave such an interesting example that his students would never   26  .
He put a wide-mouth jar(罐) on the table. Then he    27  some rocks and carefully placed them into the jar, one at a time. When   28  rocks would fit inside, he   29  , “Is this jar full?”
Everyone in class shouted, “Yes.” “Really?” The teacher pulled out a bag of small stones. He put   30  small stones in and shook the jar. The small stones went   31  into the spaces between the big rocks. He then asked the group   32  , “Is this jar full?”
“Probably not,” one of them answered. “Good!” the teacher replied. He brought out a box of sand and   33  some sand on the jar and it went between the rocks and small stones. Again he asked the   34  question, “Is this jar full?
“No,” the class shouted. Once more the teacher said, “Good.” He poured a cup of water into the jar   35  it was full. The he asked, “What is the point here?” One student   36  his hand and said, “The point is that if you try really hard, you can   37  put more things in.”
“No,” the teacher replied, “that’s not the   38  . What I want to tell you is that if you don’t put the big rocks in first, you will never get others in at all.   39  are the ‘big rocks’ in your life? Time with your friends, your education or your dreams? Remember to put the   40  in first, or you’ll never get others in at all?”
小題1:
A.rememberB.likeC.forgetD.think
小題2:
A.handed outB.took outC.carried awayD.put away
小題3:
A.no moreB.not moreC.no manyD.not many
小題4:
A.a(chǎn)nsweredB.readC.a(chǎn)skedD.said
小題5:
A.noB.fewC.a(chǎn)nyD.some
小題6:
A.upB.outC.downD.a(chǎn)way
小題7:
A.no moreB.once againC.a(chǎn) third timeD.a(chǎn) fourth time
小題8:
A.sentB.putC.boughtD.collected
小題9:
A.sameB.differentC.difficultD.common
小題10:
A.sinceB.tillC.whileD.because
小題11:
A.offeredB.placedC.raisedD.shook
小題12:
A.a(chǎn)lwaysB.a(chǎn)lreadyC.neverD.hardly
小題13:
A.pointB.exampleC.promiseD.story
小題14:
A.WhenB.WhatC.WhoD.Why
小題15:
A.sandB.small stonesC.big rocksD.water

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

The skin which covers the tips of the fingers and thumbs is crossed by numerous ridges (隆起) arranged in different patterns. These patterns are permanent from birth and remain exactly the same throughout a person's life, even when the skin becomes wrinkled and cracked as a result of old age. Such patterns are never passed on from parents to children, and no one in the world has the same patterns as anyone else. Even identical twins have different sets of fingerprints. As a result, fingerprints offer a most useful and foolproof way of identifying people. Any ridged part of the hand and the foot may be used as a means of identification, but finger impressions are usually preferred since they can be taken easily and quickly.
Fingerprints are classified in the ways: by general shapes and contours(輪廓), by the finger positions of the pattern-types, and by size (often measured by counting the ridges in the loops). Every set of fingerprints has different “ridge characteristics” (i. e. the print of each separate finger is different from that of all the other fingers), which belong to one of four basic groups: arches, loops, whorls and composites. All fingerprints can then be divided into 1, 024 groups. By using details in the patterns above, these 1, 024 groups can be further divided into thousands of smaller groups, thus making it possible to find a particular set of fingerprints in a few minutes.
小題1:According to this passage, the true statement about human fingerprints is that ____.
A.people's fingerprints sometimes can be passed on from parents to children
B.people’s fingerprints are unique but identical twins may have the same fingerprints
C.using fingerprints is the only way to identify people
D.people's fingerprints will not change in all their lives
小題2:We prefer to use fingerprints to identify people because ____.
A.we can never find the same set of fingerprints among human beings
B.finger impressions can be taken easily and quickly
C.fingerprints offer a most useful and foolproof way of identifying people
D.a(chǎn)ll of the above
小題3:The word “foolproof” (Line 7, Para. 1) most probably means ____.
A.that is permanent B.that is acceptable
C.that can not go wrong D.that is not foolish
小題4:About the classification of fingerprints, which is TRUE? ____.
A.Fingerprints can be classified in three ways
B.All fingerprints can be divided into 1, 024 groups and can not be divided further
C.It is not easy to find a particular set of fingerprints in a short time
D.People can not classify the fingerprints in an effective way

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

She had been shopping with her Mom in Wal-Mart.She must have been 6 years old, this beautiful brown haired, freckle-faced image of innocence.Outside, it was pouring so heavily.
We all stood there just inside the door of the Wal-Mart.We waited, some patiently, others annoyed because nature messed up their hurried day.I got lost in the sound and sight of the heavens washing away the dirt and dust of the world.
Her voice was so sweet as it broke the hypnotic trance (昏昏欲睡) we were all caught in."Mom, let's run through the rain," she said.
"No, honey.We'll wait until it slows down a bit," Mom replied.
This young child waited about another minute and repeated: "Mom, let's run through the rain."
" We'll get wet totally if we do," Mom said.
"No, we won't, Mom.That's not what you said this morning," the young girl said as she tore at her Mom's arm.
"This morning? When did I say we could run through the rain and not get wet?"
"Don't you remember? When you were talking to Daddy about his cancer, you said, If God can get us through this, he can get us through anything!"
The entire crowd stopped dead silent.I dare say you couldn't hear anything but the rain.We all stood silently. No one came or left in. the next few minutes,Mom paused and thought for a moment about what she would say.
Now some would laugh it off and scold her for being silly.Some might even ignore what was said. But this was a moment of affirmation in a young child's lifetime when innocent trust can be developed so that it will bloom into faith."Honey, you are absolutely right.Let's run through the rain.If get wet, well maybe we just need washing," Mom said.Then off they ran.
We all stood watching, smiling and laughing as they rushed past the cars and they held their shopping bags over their heads just in case.They got soaked.But they were followed by a few who screamed and laughed like children all the way to their cars.And yes, I did.I ran.I got wet.I needed washing.
You may lose your material possessions, your money and even your health, but no one can ever take away your precious memories.So don't forget to make time and take the opportunities to make memories.
小題1:Which of the following is the closest in meaning to the underlined word "affirmation"?
A.happiness B.a(chǎn)pproval C.disagreementD.love
小題2:What do we know about the mother in the story?
A.Her husband was cured of his cancer.
B.She was strong-willed and considerate.
C.She was in despair and pretended to forget what she said.
D.Her daughter completely understood the situation her family was in.
小題3:Which of the following may the author agree with?
A.The mother should not tell her child about the family misfortune.
B.Parents should act more bravely than their children.
C.Parents should grasp every opportunity to influence their children to grow well.
D.Children should learn to show gratitude and understanding to their parents.
小題4:The best title for the passage might be _____.
A.Run Through the RainB.Be a Determined Mother
C.Wait in the RainD.Have a Wonderful Experience

查看答案和解析>>

同步練習(xí)冊(cè)答案