问题:共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells like plants andflowers. There are 175 different kinds of trees,and 60 kinds of birds live here.______(1)You are downtown in the city of Nara,Japan,in Kasugayama Forest,the oldest urban forest in the world. It was started more than a thousand years ago,and today it's very popular with tourists and artists.Cities around the world are working to protect their urban forests. Some urban forests are parks,and some are just streets with a lot of trees. But all urban forests have many good effects on the environment.______(2)They also stop the noise from heavy traffic. They even make the weather better because they make the air 3-5 degrees cooler,and they stop strong winds.Urban forests also have many good effects on people. They make the city more beautiful. In a crowded area,they give people a place to relax and spend time in nature.______(3)In some countries,people are starting new urban forests. In England,there are now 1.3 million trees in an urban forest called Thames Chase,east of London. It was started in 1990, and it has grown very fast.Walking and bicycle clubs use the forest,and there are programs for children and artists.______(4)Some older cities don't have space for a big urban forest,but planting trees on the streets makes the city better. Scientists found that commuters(通勤人员)feel more relaxed when they can see trees. Trees are even good for business.______(5)In the future,urban forests will become even more important as our cities grow bigger. In the megacities(超大城市)of to-morrow,people will need more green space to live a comfortable life. Planting trees today will make our lives better in the future.______(5)A: People spend more time at shopping centers that have trees.B: In hot countries,urban forests are cool places for walking and other healthy exercises.C: But you are not in rural area.D: Trees take pollution out of the air.E: In 2033,it will have 5 million trees.F: It has many kinds of birds in the country.
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问题:Michael is now merely a good friend,A:largely B:barely C:just D:rarely
问题:共用题干 Citizen ScientistsUnderstanding how nature responds to climate change will require monitoring key life cycle events-flowering,the appearance of leaves,the first frog calls of the spring-all around the world.But ecologists can't be______(51)so they are turning to non-scientists,sometimes called citizen scientists,for help.Climate scientists are not present everywhere.______(52)there are so many places in the world and not enough scientists to observe all of them,they are asking for your help in_______(53)signs of climate change across the world.The citizen scientist movement encourages______(54)people to observe a very specific research interest-birds,trees,flowers budding,etc-and send their observations______(55)a giant database to be observed by professional scientists.This helps a small number of scientists track a______(56)amount of data that they would never be able to gather on their own.______(57)like citizen journalists helping large publications cover a hyper-local beat,citizen scientists are ready for the conditions where they live.______(58)that's needed to become one is a few minutes each day or each week to gather data and_______(59)it in.A group of scientists and educators launched an organization last year______(60) the NationalPhenology(生物气候学)Network."Phenology" is what scientists call the study of the timing of events in nature.One of the group's first efforts relies on scientists and non-scientists______(61)to collect data about plant flowering and leafing every year.The program,called Project BudBurst,collects life cycle______(62)on a variety of common plants from across the United States.People participating in the project-which is______(63)to everyone-record their observations on the Project BudBurst website."People don't______(64)to be plant experts-they just have to look around and see what's in their neighborhood,"says Jennifer Scheartz,an education consultant with the project."As we collect this data,we'11 be able to make an'estimate of______(65)plants and communities of plants and animals will respond as the climate changes."_________62A:points B:wonders C:data D:interests
问题:共用题干 The iPad1 The iPad is a tablet computer(平板电脑)designed and developed by Apple. It is par-ticularly marketed as a platform for audio and visual media such as books,periodicals(期刊),movies,music,and games,as well as web content. At about 1 .5 pounds(680 grams), its size and weight are between those of most contemporary smartphones and laptop comput-ers.Apple released the iPad in April 2010,and sold 3 million of the devices in 80 days.2 The iPad runs the same operating system as iPod Touch and iPhone. It can run its own applications as well as ones developed for iPhone. Without modification,it will only run pro-grams approved by Apple and distributed via its online store.3 Like iPhone and iPod Touch,the iPad is controlled by a multitouch display一a break from most previous tablet computers, which uses a pressure-triggered stylus(触控笔).The iPad uses a Wi-Fi data connection to browse(浏览)the Internet, load and stream media, and install software. Some models also have a 3G wireless data connection which can connect to GSM 3G data networks. The devices is managed and synchronized(同步)by iTunes on a per-sonal computer via USB cable.4 An iPad has different features and applications one can use to execute different and in-teresting things. There are lots of iPad applications that the owner can use to enhance the way they communicate. Some of these are how to use social networking sites and other online options.One of the most common uses is for e-mail services. iPad applications like Markdown Mail allow the adoption of specific and particular options. They enable the owner to personal-ize their email accounts.5 While the iPad is mostly used by consumers it also has been taken up by business us-ers. Some companies are adopting iPads in their business offices by distributing or making available iPads to employees.Examples of uses in the workplace include lawyers responding to clients,medical professionals accessing health records during patient exams,and manag-ers approving employee requests.A survey by Frost Sullivan shows that iPad usage in work-places is linked to the goals of increased employees productivity,reduced paperwork,and in-creased revenue.Paragraph 3______A: Online StoresB: Differences from iPhoneC: Display and Data ConnectionD: Business UsageE: Features and ApplicationsF: Operating System
问题:共用题干 第三篇Almost Human?Scientists are racing to build the world's first thinking robot.This is not science fiction: some say they will have made it by the year 2020.Carol Packer reports.Machines that walk,speak and feel are no longer science fiction.Kismet is the nameof an android(机器人)which scientists have built at the Massachusetts Institute of Technology(MIT).Kismet is different from the traditional robot because it can show human emotions.Its eyes,ears and lips move to show when it feels happy,sad or bored. Kismet is one of the first of a new generation of androids一robots that look like human beings一which can imitate human feelings.Cog,another android invented by the MIT, imitates the action of a mother. However,scientists admit that so far Cog has the mental ability of a two-year-old.The optimists(乐观主义者)say that by the year 2020 we will have created humanoids (机器人)with brains similar to those of an adult human being. These robots will be designed to look like people to make them more attractive and easier to sell to the public. What kind of jobs will they do?In the future,robots like Robonaut,a humanoid invented by NASA,will be doing dangerous jobs,like repairing space stations.They wi}{also be doing more and more of the household work for us.In Japan,scientists are designing androids that will entertain us by dancing and playing the piano.Some people worry about what the future holds:will robots become monsters(怪物)? Will people themselves become increasingly like robots?Experts predict that more and more people will be wearing micro-computers,connected to the Internet,in the future.People will have micro-chips in various parts of their body,which will connect them to a wide variety of gadgets(小装置).Perhaps we should not exaggerate(夸大)the importance of technology,but one wonders whether,in years to come,we will still be falling in love, and whether we will still feel pain.Who knows?Kismet is different from traditional robots becauseA:it thinks for itself. B:itis not like science fiction.C:it can look after two-year-olds. D:it seems to have human feelings.
问题:共用题干 When Our Eyes Serve Our StomachOur senses aren't just delivering a strict view of what's going on in the world;they're af-fected by what's going on in our heads. A new study finds that hungry people see food-related words more clearly than people who'ye just eaten.Psychologists have known for decades that what's going on,inside our head affects our senses. For example,poorer children think coins are larger than they are,and hungry people think pictures of food are brighter. Remi Radel of University of Nice Sophia-Antipolis,France,wanted to investi-gate how this happens. Does it happen right away as the brain receives signals from the eyes or a lit-tle later as the brain's high-level thinking processes get involved.Radel recruited 42 students with a normal body mass index. On the day of his or her test,each student was told to arrive at the lab at noon after three or four hours of not eating. Then they were told there was a delay. Some were told to come back in 10 minutes;others were given an hour to get lunch first. So half the students were hungry when they did the ex-periment and the other half had just eaten.For the experiment,the participant looked at a computer screen. One by one,80 words flashed on the screen for about 1/300th of a second each. They flashed at so small a size thatthe students could only consciously perceive. A quarter of the words were food-related. After each word,each person was asked how bright the word was and asked to choose which of two words they'd seen一a food-related word like cake or a neutral word like boat. Each word ap-peared too briefly for the participant to really read it.Hungry people saw the food-related words as brighter and were better at identifying food-related words. Because the word appeared too quickly for them to be reliably seen,this means that the difference is in perception,not in thinking processes,Radel says.“This is something great to me. Humans can really perceive what they need or what they strive for. From the experiment,I know that our brain can really be at the disposal of our mo-tives and needs,”Radel says.There was a delay in Radel's experiment because_______.A: he needed more students to joinB: he didn't prepare enough food for the 42 studentsC: he wanted two groups of participants,hungry and non-hungryD: he didn't want to have the experiment at noon
问题:共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin drugs free of1so that customers can reduce the heart disease dangers of fatty food,researchers at Imperial College London 2in a new study.Statins reduce the3of unhealthy“LDL” cholesterol in the blood. A wealth of trial data has proven them to be highly effective at lowering a person's heart attack4.In a paper published in the American Journal of Cardiology,Dr Darrel Francis and colleagues calculate that the reduction in heart attack risk offered by a statin is5to offset the increase in heart attack risk from6a cheeseburger and drinking a milkshake.Dr Francis,from the National Heart and Lung Institute at Imperial College London,who is the senior author of the study,said:“Statins don't cut out all of the7effects of cheeseburgers and French fries. It's better to avoid fatty food altogether. But we've worked out that in terms of your8of having a heart attack. Taking a statin can reduce your risk to more or less the same9 as a fast food meal increases it.”“It's ironic that people are free to take as many unhealthy condi-ments in fast food outlets as they10,but statins,which are beneficial to heart health,have to be prescribed. It makes sense to make risk-reducing statins available just as easily as the unhealthy condiments that are 11 free of charge. It would cost less than 5 pence per/u>12一not much different to a sachet of sugar.”Dr Francis said.When people engage in risky behaviours like driving or smoking,they're encouraged to take13that lower their risk,like14a seatbelt or choosing cigarettes with filters.Taking a statin is a rational way of15some of the risks of eating a fatty meal.3._________A: number B: amount C: volume D: product
问题:共用题干 第三篇Weaving with LightIn the Sierra Madre mountain range of west central Mexico,the native Huichol people live much the way their ancestors did一without electricity,That’s because it's too expensive to string power lines to the remote mountain areas where they live.To help support themselves,the Huichol create beautiful artwork. They sell their art in cities hundreds of miles away from their villages.And without electricity一at home or on the road,they can only work during daylight hours?When it gets dark,they must stop whatever they'redoing.Now,a team of scientists,designers,and architects is using new technologies to provide the Huichol with light after the sun sets.The scientists'technique involves weaving tiny electronic crystals into fabrics that can be made into clothes,bags,or other items.By collecting the sun’s energy during the day,these lightweight fabrics provide bright white light atnight一 Their inventors have named the fabrics" Portable(轻便的)Lights."Portable Lights have the potential to transform the lives of people without electricity around the world.At the core of Portable Lights technology are devices called high-brightness light-emitting diodes(高亮 度发光二极管),or HB LEDs. These tiny lights appear in digital clocks, televisions, and streetlights.LEDs are completely different from the light bulbs(灯泡).Most of those glass bulbs belong to a type called incandescent lights(白炽灯).Inside, electricity heats a metal coil(线圈)to about 2. 200 degrees Celsius.At that temperature,bulbs give off light we can see.Ninety percent of energy produced by mnean- descent lights,however,is heat一and invisible.With all that wasted energy,bulbs burn out quickly. Theyare also easily broken.LEDs,on the other hand,are like tiny pieces of rock made up of molecules(分子)that are arranged in a crystal structure.When an electric current passes through a LED,the crystal structure produces light. Un- like incandescent bulbs,they can produce light of various colors.Within a LED,the type of molecules and their particular arrangement determine what color is produced.LEDs are different from light bulbs in that__________.A:LEDg are made up of tiny pieces of rockB:LEDs can send out light of different colorsC:LEDs belong to incandescent lightsD:LEDs look like crystals
问题:共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles(束)of electromagnetic(电磁)energy called photons(光子).Today,scientists agree that light has a dual(二重)nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference(干扰), etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel(旋转齿轮)between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum(真空),however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Some instances such as reflection and absorption can change______.A: sources of lightB: the speed of lightC: the path of lightD: a straight lineE: a beam of lightF: a form of energy
问题:共用题干 第一篇The News Industry in USWhy do so many Americans distrust what they read in their newspapers?The American Society of Newspaper Editors is trying to answer this painful question.The organization is deep into a long self-analysis known as the journalism credibility project.Sad to say,this project has turned out to be mostly low-level findings about factual errors and spelling and grammar mistakes,combined with lots of head-scratching puzzlement about what in the world those readers really want.But the sources of distrust go way deeper. Most journalists learn to see the world through a set of standard templates(patterns)into which they plug each day's events.In other words,there is a conventional story line in the newsroom culture that provides a backbone and a ready-made narrative structure for otherwise confusing news.There exists a social and cultural disconnect between journalists and their readers,which helps explain why the"standard templates"of the newsroom seem alien to many readers.In a recent survey,questionnaires were sent to reporters in five middle-size cities around the country,plus one large metropolitan area. Then residents in these communities were phoned at random and asked the same questions.Replies show that compared with other Americans,journalists are more likely to live in upscale neighborhoods,have maids,own Mercedeses,and trade stocks,and they're less likely to go to church, do volunteer work,or put down roots in a community.Reporters tend to be part of a broadly social and cultural elite,so their work tends to reflect the conventional values of this elite. The astonishing distrust of the news media isn't rooted in inaccuracy or poor reportorial skills but in the daily clash of world views between reporters and their readers.This is an explosive situation for any industry,particularly a declining one.Here is a troubled business that keeps hiring employees whose attitudes vastly annoy the customers.Then it sponsors lots of symposiums and a credibility project dedicated to wondering why customers are annoyed and fleeing in large numbers.But it never seems to get around to noticing the cultural and class biases that so many former buyers are complaining about. If it did,it would open up its diversity program, now focused narrowly on race and gender,and look for reporters who differ broadly by outlook, values,education,and class.The basic problem of journalists as pointed out by the writer lies in their_______.A:working attitudeB:conventional lifestyleC:world outlookD:educational background
问题:共用题干 If you made a list of all the jobs performed by the different kinds of energy,you would fill many pages.Nuclear energy is used in some areas of the United States.But there are dangers.Waste materials from nuclear______(51)would destroy life if they leaked______(52)the land.When nuclear energy is produced,a lot of______(53)is produced,too,50 a flow of lake or ocean water 15 used to cool the operations.Then the water______(54)to its source.If the returning water were too hot,it would destroy fish and other______(55).Cow manure is being used to produce a kind of______(56).The manure from farms is put into a machine to convert it to a liquid.Then the gas 15 formed______(57)a natural process.If the converter were not 50______(58)at the present time,it would be used in many places to provide______(59).Garbage has become an energy source.It______(60)to oil,steam,or electricity,or it is used on the land.But recent______(61)about power supplies has led to increased interest in the use of wind______(62)a source of electrical power.Windmills are clean and they______(63)no waste.And they use a______(64)resource.Some scientists consider that wind energy systems can fulfill a valuable______(65)in meeting the energy needs of industrialized nations and of the developing world._________(65)A:role B:dutyC:service D:function
问题:共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These researchers tinker(修补)with ma- chines in the lab and write computer software to control these devices."They're the best toys out there," says Howie Choset at Carnegie Mellon University in Pittsburgh.Choset is a roboticist,a person who designs, builds or programs robots.When Choset was a kid,he was interested in anything that moved一cars,trains,animals.He put motors on Tinkertoy cars to make them move.Later,in high school,he built mobile robots similar to small cars,Hoping to continue working on robots,he studied computer science in college.But when he got to graduate school at the California Institute of Technology in Pasadena,Choset’。labmates were working on something even cooler than remotely controlled cars:robotic snakes.Some robots can move only forward, hackward, left and right. But snakes can twist(扭曲)in many directions and travel over a lot of different types of terrain(地形)."Snakes are far more interesting than the cars,"Choset concluded.After he started working at Carnegie Mellon,Choset and his colleagues there began developing their own snake robots.Choset's team programmed robots to perform the same movements as real snakes,such as sliding and inching forward.The robot、also moved in ways that snakes usually don't,such as rolling. Choset’s snake robots could crawl(爬行)through the grass,swini in a pond and even climb a flagpole.But Choset wondered if his snakes might be useful for medicine as well.For some heart surgeries,the doctor has to open a patient's chest,cutting through the breastbone.Recovering from these surgeries can be very painful.What if the doctor could perform the operation by instead making a small hole in the body and sending in a thin robotic snake?Choset teamed up with Marco Zenati,a heart surgeon now at Harvard Medical School,to investigate theidea.Zenati practiced using the robot on a plastic model of the chest and they tested the robot in pigs. A company caikd Medrobotics in Boston is now adapting the technology for g urgerie9 on people-Even after 15 years of working with his team’s creations,"I still don't get bored of watching the motionof my robots,"Clioset says.Choset began to build robots in high school.A:RightB:WrongC:Not mentioned
问题:The sea turtle's natural habitat has been considerably reduced.A:suddenlyB: generallyC: slightlyD: greatly
问题:共用题干 第一篇What Does GMO Free Mean?Genetically modified organisms(GMOs)in food are concern for a number of consumers who are worried about the impact that GMOs may have on their health.As a result,many companies in the late 1990s began to apply the GMO free label,indicating that their food does not contain genetically modified organisms.A number of nations legislate labeling,and in Europe,food must be labeled to indicate whether or not it contains GMOs.In the United States,however,GMO free labeling is purely voluntary and not regulated by any governmental body or organization.Since it is not regulated,there has been some question about the validity of the GMO free label in the US.A number of organizations have pressured the Food and Drug Administration(FDA),as well as the United States Department of Agriculture(USDA),to enact legislation governing food labeling in regards to GMOs.Many food activists want a label that is standardized,so that consumers who are concerned about this issue can be assured about the GMO content of products they purchase.Most US consumers have foods containing GMOs in their home.The majority of corn and soybeans grown in the US have been modified,as have several other crops.Some research indicates that many processed foods contain GMO ingredients,so for consumers who are concerned about this issue,GMO free labeling would be helpful.For consumers who want to eat natural,organic foods,knowing that the products they buy are GMO free is often very important. Although there is no federal labeling program in the US,some organic farmers and natural food producers have chosen to start their own certification programs.Getting certified through such programs can be very difficult,but many producers believe consumers will be willing to pay extra for the verification.The harmful nature of GMOs has been questioned,especially by commercial agriculture producers and seed providers.No scientific evidence has been found to suggest that genetic modification of crops is harmful to humans. Some consumers feel that it is important to be able to make conscious choices about what they eat,however,and want the ability to choose GMO free foods if they so desire.Some studies suggest that GMOs may be harmful to agriculture,with cloned genetically modified species harming overall biological diversity and modified genes finding their way into wild plants and non-modified crops.This is especially true in the case of corn,where GMO contamination became a major issue in the 1990s.Other research,however,indicates that genetically modified crops can be of benefit to the environment. Plants designed to be resistant to herbicides(除草剂)and pesticides (杀虫剂),for example,have been seen to reduce the amount of these chemicals used by farmers on both GM and non-modified crops.A number of organizations in America have pressured the Food and Drug Administration(FDA) to______.A: ban foods containing GMOsB:punish commercial agriculture producers and seed providersC:enact legislation governing food labeling in regards to GMOsD:abolish legislation governing food labeling in regards to GMOs
问题:He is renowned for his skill.A:remembered B:recommended C:praised D:well-known
问题:共用题干 EL NinoWhile some forecasting methods had limited success predicting the 1997 EL Nino(厄尔尼诺现象,指赤 道东太平洋南美沿岸海水温度剧烈上升的现象。) a few months in advance , the Columbia University researchers say their method can predict large EL Nino events up to two years in advance.That would be good news for governments,farmers and others seeking to plan for the droughts and heavy rainfall that EL Nino can produce in various parts of the world.Using a computer,the researchers matched sea-surface temperatures to later EL Nino occurrences(发 生)between 1980 and 2000 and were then able to anticipate EL Nino events dating back to 1857,using priorsea-surface temperatures.The results were reported in the latest issue of the journal Nature.The researchers say their method is not perfect , but Bryan C. Weare , a meteorologist(气象学家)at the University of California,Davis,who was not involved in the work,said it"suggests EL Nino is indeed predictable"."This will probably convince others to search around more for even better methods,"said Weare.He added that the new method " makes it possible to predict EL Nino at long lead(提前的)times ". Other models also use sea-surface temperatures,but they have not looked as far back because they need other data, which is only available for recent decades,Weare said.The ability to predict the warming and cooling of the Pacific is of immense importance.The 1997 EL Nino , for example , caused an estimated $20 billion in damage worldwide , offset(抵消)by beneficial effects in other areas,said David Anderson,of the European Centre for Medium-Range Weather Forecasts in Reading , England. The 1877 EL Nino , meanwhile , coincided(同时发生)with a failure of the Indian monsoon and a famine that killed perhaps 40 million in India and China,prompting the development of seasonal forecasting,Anderson said.When EL Nino hit in 1991 and 1997,200 million people were affected by flooding in China alone, according to a 2002 United Nations report.While predicting smaller EL Nino events remains tricky(复杂的), the ability to predict larger ones should be increased to at least a year if the new method is confirmed.EL Nino tends to develop between April and June and reaches its peak between December and February.The warming tends to last between 9 and 1 2 months and occurs every two to seven years.The new forecasting method does not predict any major EL Nino events in the next two years,although a weak warming toward the end of this year is possible.According to a Chinese report,the flooding in China caused by EL Nino in 1991 and 1997 affected 200 million Chinese people.A:RightB:WrongC:Not mentioned
问题:共用题干 Robotic Highway ConesA University of Nebraska professor has developed robotic cones and barrels.These robotic cones and barrels can move out of the way,or into______(51),from computer commands made miles away. They can even be programmed to move on their own at any particular part of the day,said Shane Farritor,an assistant professor of mechanical engineering at Nebraska.For example,if workers arrived at 6 am,the cones could move from the side of the highway to______(52)off the lane at that time.And they can return to the______(53)place at the end of the day."It just seems like a very good application for robots."Farritor said."The robot-ic cones would also help______(54)people from hazardous jobs on the highway putting barrels and cones into place,"Farritor said in a report on his creation.Work on the idea began in 2002 using a National Academy of Sciences grant. The______ (55)allowed Farritor to work on the project with graduate students at Nebraska and his assistant Steve Goddard.The robots are placed at the bottom of the cones and barrels and are______(56)enough not to greatly change the appearance of the construction aides."It would look exactly the same," Farritor said."______(57)there's a kind of rubbery,black base to them. We replace that ______(58)a robot."Farritor has talked with officials from the Nebraska Department of Roads about how the robots would be most______(59)to what they might need.The robots could come in handy following a slow-moving maintenance operation,like paint-ing a stripe on a road or moving asphalt,______(60)now the barrels have to be picked up and moved as the operation______(61)."That way you don't have to block off a 10-mile strip for the operation,"Farritor said.______(62)prototypes have been made,they are not in use anywhere. Farritor said he has______(63)for a patent and is considering what to do next. He is thinking about starting a small business. He is also thinking about______(64)the robots to roads departments and others across the country who may______(65)from them.55._________A: ideaB: reportC: demandD: fund
问题: You will be meeting her presently.A:shortly B:currently C:lately D:probably
问题:A large crowd assembled outside the American embassy.A:gatheredB: watchedC: shoutedD: walked
问题:共用题干 What is the Coolest Gas in the Universe?What is the coldest air temperature ever recorded on Earth?Where was this low temperature recorded ?The coldest recorded temperature on Earth was -91℃, which_____ (51) in Antarctica(南极洲) in 1983.We encounter an interesting situation when we discuss temperatures in_________(52).Temperatures in Earth orbit(轨道)actually range from about +120℃ to -120℃. The temperature depends upon ______(53)you are in direct sunlight or in shade.Obviously,-120℃ is colder than our body can ________ (54)endure.The space temperatures just discussed affect only our area of the solar________(55).Obviously,it is hotter closer to the Sun and colder as we travel__________(56)from the Sun,Scientigtg egtimate tern- peratures at Pluto are about -210℃.How cold is the lowest estimated temperature in the entire universe?Again,it depends upon your_________(57).We are taught it is supposedly__________(58)to have atemperature below absolute zero,which is-273℃,at which atoms do not move.Two scientists,Cornell and Wieman,have successfully______(59)down a gas to a temperature barely above absolute zero. They won a Nobel Prize in Physics in 2001 for their work一not a discovery in this case.Why is the two scientists'work so important to science?In the 1920s,Satyendra Nath Bose was studying an interesting_______(60)about special light par-tidles(微粒)we now call photons(光子).Bose had trouble __________(61)other scientists to believe his theory,so he contacted Albert Einstein. Einstein’s calculations helped him theorize that atoms_______(62) behave as Bose thought一but only at very cold temperatures.Scientists have also discovered that ultra-cold(超冷)atoms can help them make the world'S atomic clocks even__________(63)accurate.These clocks are so accurate today they would oniy lose one second _________ (64)six million years!Such accuracy will help us travel in space because digtanee is velocity(速度)times time( d=vt).With the long distances involved in space _______(65),we need to know time as accurately as possibie to get accurate distance._________(53)A:whetherB:whereC:whatD:when