1 . On March 7, 1907, the English statistician Francis Galton published a paper which illustrated what has come to be known as the “wisdom of crowds” effect. The experiment of estimation he conducted showed that in some cases, the average of a large number of independent estimates could be quite accurate.
This effect capitalizes on the fact that when people make errors, those errors aren’t always the same. Some people will tend to overestimate, and some to underestimate. When enough of these errors are averaged together, they cancel each other out, resulting in a more accurate estimate. If people are similar and tend to make the same errors, then their errors won’t cancel each other out. In more technical terms, the wisdom of crowds requires that people’s estimates be independent. If for whatever reasons, people’s errors become correlated or dependent, the accuracy of the estimate will go down.
But a new study led by Joaquin Navajas offered an interesting twist (转折) on this classic phenomenon. The key finding of the study was that when crowds were further divided into smaller groups that were allowed to have a discussion, the averages from these groups were more accurate than those from an equal number of independent individuals. For instance, the average obtained from the estimates of four discussion groups of five was significantly more accurate than the average obtained from 20 independent individuals.
In a follow-up study with 100 university students, the researchers tried to get a better sense of what the group members actually did in their discussion. Did they tend to go with those most confident about their estimates? Did they follow those least willing to change their minds? This happened some of the time, but it wasn’t the dominant response. Most frequently, the groups reported that they “shared arguments and reasoned together”. Somehow, these arguments and reasoning resulted in a global reduction in error. Although the studies led by Navajas have limitations and many questions remain, the potential implications for group discussion and decision-making are enormous.
1. What is paragraph 2 of the text mainly about?A.The methods of estimation. | B.The underlying logic of the effect. |
C.The causes of people’s errors. | D.The design of Galton’s experiment. |
A.the crowds were relatively small | B.there were occasional underestimates |
C.individuals did not communicate | D.estimates were not fully independent |
A.The size of the groups. | B.The dominant members. |
C.The discussion process. | D.The individual estimates. |
A.Unclear. | B.Dismissive. | C.Doubtful. | D.Approving. |
2 . When John Todd was a child, he loved to explore the woods around his house, observing how nature solved problems. A dirty stream, for example, often became clear after flowing through plants and along rocks where tiny creatures lived. When he got older, John started to wonder if this process could be used to clean up the messes people were making.
After studying agriculture, medicine, and fisheries in college, John went back to observing nature and asking questions. Why can certain plants trap harmful bacteria (细菌)? Which kinds of fish can eat cancer-causing chemicals? With the right combination of animals and plants, he figured, maybe he could clean up waste the way nature did. He decided to build what he would later call an eco-machine.
The task John set for himself was to remove harmful substances from some sludge (污泥). First, he constructed a series of clear fiberglass tanks connected to each other. Then he went around to local ponds and streams and brought back some plants and animals. He placed them in the tanks and waited. Little by little, these different kinds of life got used to one another and formed their own ecosystem. After a few weeks, John added the sludge.
He was amazed at the results. The plants and animals in the eco-machine took the sludge as food and began to eat it! Within weeks, it had all been digested, and all that was left was pure water.
Over the years, John has taken on many big jobs. He developed a greenhouse — like facility that treated sewage (污水) from 1,600 homes in South Burlington. He also designed an eco-machine to clean canal water in Fuzhou, a city in southeast China.
“Ecological design” is the name John gives to what he does. “Life on Earth is kind of a box of spare parts for the inventor,” he says. “You put organisms in new relationships and observe what’s happening. Then you let these new systems develop their own ways to self-repair.”
1. What can we learn about John from the first two paragraphs?A.He was fond of traveling. | B.He enjoyed being alone. |
C.He had an inquiring mind. | D.He longed to be a doctor. |
A.To feed the animals. | B.To build an ecosystem. |
C.To protect the plants. | D.To test the eco-machine. |
A.To review John’s research plans. | B.To show an application of John’s idea. |
C.To compare John’s different jobs. | D.To erase doubts about John’s invention. |
A.Nature can repair itself. | B.Organisms need water to survive. |
C.Life on Earth is diverse. | D.Most tiny creatures live in groups. |
3 . Yellowstone National Park offers a variety of ranger programs throughout the park, and throughout the year. The following are descriptions of the ranger programs this summer.
Experiencing Wildlife in Yellowstone (May 26 to September 2)
Whether you’re hiking a backcountry trail (小径), camping, or just enjoying the park’s amazing wildlife from the road, this quick workshop is for you and your family. Learn where to look for animals and how to safely enjoy your wildlife watching experience. Meet at the Canyon Village Store.
Junior Ranger Wildlife Olympics (June 5 to August 21)
Kids can test their skills and compare their abilities to the animals of Yellowstone. Stay for as little or as long as your plans allow. Meet in front of the Visitor Education Center.
Canyon Talks at Artist Point (June 9 to September 2)
From a classic viewpoint, enjoy Lower Falls, the Yellowstone River, and the breathtaking colors of the canyon (峡谷) while learning about the area’s natural and human history. Discover why artists and photographers continue to be drawn to this special place. Meet on the lower platform at Artist Point on the South Rim Drive for this short talk.
Photography Workshops (June 19 & July 10)
Enhance your photography skills — join Yellowstone’s park photographer for a hands-on program to inspire new and creative ways of enjoying the beauty and wonder of Yellowstone.
6/19 — Waterfalls &Wide Angles: meet at Artist Point.
7/10 — Wildflowers &White Balance: meet at Washburn Trailhead in Chittenden parking area.
1. Which of the four programs begins the earliest?A.Photography Workshops. | B.Junior Ranger Wildlife Olympics. |
C.Canyon Talks at Artist Point. | D.Experiencing Wildlife in Yellowstone. |
A.Works of famous artists. | B.Protection of wild animals. |
C.Basic photography skills. | D.History of the canyon area. |
A.Artist Point. | B.Washburn Trailhead. |
C.Canyon Village Store. | D.Visitor Education Center. |
4 . The connection between people and plants has long been the subject of scientific research. Recent studies have found positive effects. A study conducted in Youngstown,Ohio,for example, discovered that greener areas of the city experienced less crime. In another,employees were shown to be 15% more productive when their workplaces were decorated with houseplants.
The engineers at the Massachusetts Institute of Technology(MIT)have taken it a step further changing the actual composition of plants in order to get them to perform diverse,even unusual functions. These include plants that have sensors printed onto their leaves to show when they’re short of water and a plant that can detect harmful chemicals in groundwater. "We’re thinking about how we can engineer plants to replace functions of the things that we use every day,"explained Michael Strano, a professor of chemical engineering at MIT.
One of his latest projects has been to make plants glow(发光)in experiments using some common vegetables. Strano’s team found that they could create a faint light for three-and-a-half hours. The light,about one-thousandth of the amount needed to read by,is just a start. The technology, Strano said, could one day be used to light the rooms or even to turn trees into self-powered street lamps.
In the future,the team hopes to develop a version of the technology that can be sprayed onto plant leaves in a one-off treatment that would last the plant’s lifetime. The engineers are also trying to develop an on and off"switch"where the glow would fade when exposed to daylight.
Lighting accounts for about 7% of the total electricity consumed in the US. Since lighting is often far removed from the power source(电源)-such as the distance from a power plant to street lamps on a remote highway-a lot of energy is lost during transmission(传输).Glowing plants could reduce this distance and therefore help save energy.
1. What is the first paragraph mainly about?A.A new study of different plants. |
B.A big fall in crime rates. |
C.Employees from various workplaces. |
D.Benefits from green plants. |
A.To detect plants’ lack of water |
B.To change compositions of plants |
C.To make the life of plants longer. |
D.To test chemicals in plants. |
A.They will speed up energy production. |
B.They may transmit electricity to the home. |
C.They might help reduce energy consumption. |
D.They could take the place of power plants. |
A.Can we grow more glowing plants? |
B.How do we live with glowing plants? |
C.Could glowing plants replace lamps? |
D.How are glowing plants made pollution-free? |
5 . Many people believe that working to the maximum is the secret to success, but research has found that moderation(适度) also gets results on the job.
In a study led by Ellen Langer of Harvard University, researchers asked people to translate sentences into a new made-up language. Subjects who practiced the language moderately beforehand made fewer errors than those who practiced extensively or not at all. High levels of knowledge can make people too attached to traditional ways of viewing problems across fields the arts, sciences, and politics. High conscientiousness is related to lower job performance, especially in simple jobs where it doesn’t pay to be a perfectionist.
How long we stay on the clock and how we spend that time are under careful examination in many workplaces. The young banker who eats lunch at his desk is probably seen as a go-getter, while his colleagues who chat over a relaxed conference-room meal get dirty looks from the corner office. “People from cultures that value relationships more than ours does are shocked by the thought of eating alone in front of a computer”, says Art Markman, a professor of psychology at the University of Texas, Austin. Social interaction has been shown to lift mood(情绪) and get people thinking in new directions and in ways that could help improve any post-lunch effort.
Markman also promotes off-task time. “Part of being a good thinker is experiencing things that are seemingly unrelated to what you are working on at the moment but give you fresh ideas about your work,” he says. “Also, there is a lot of research showing that a positive mood leads to higher levels of productivity and creativity. So, when people do things to increase their life satisfaction, they also make themselves more effective at work.”
1. What does Ellen Langer’s study show?A.It is worthwhile to be a perfectionist | B.Translation makes people knowledgeable. |
C.Simpler jobs require greater caution. | D.Moderate effort produces the best result. |
A.is good at handling pressure | B.works hard to become successful |
C.a has a natural talent for his job. | D.gets on well with his co-workers |
A.A good thinker is able to inspire other people. |
B.Experience unrelated to your job is useless. |
C.A cheerful mood helps make a creative mind. |
D.Focusing on what you do raises productivity. |
A.Middle-of-the-road work habits. | B.Balance between work and family. |
C.Long-standing cultural traditions. | D.Harmony in the work environment. |
6 . For Canaan Elementary’s second grade in Patchogue, N.Y., today is speech day, and right now it’s Chris Palaez’s turn. The 8-year-old is the joker of the class. With shining dark eyes, he seems like the kind of kid who would enjoy public speaking.
But he’s nervous. “I’m here to tell you today why you should … should…” Chris trips on the “-ld,” a pronunciation difficulty for many non-native English speakers. His teacher, Thomas Whaley, is next to him, whispering support. “…Vote for …me …” Except for some stumbles, Chris is doing amazingly well. When he brings his speech to a nice conclusion, Whaley invites the rest of the class to praise him.
A son of immigrants, Chris stared learning English a little over three years ago. Whaley recalls (回想起) how at the beginning of the year, when called upon to read, Chris would excuse himself to go to the bathroom.
Learning English as a second language can be a painful experience. What you need is a great teacher who lets you make mistakes. “It takes a lot for any student,” Whaley explains, “especially for a student who is learning English as their new language, to feel confident enough to say, ‘I don’t know, but I want to know.’”
Whaley got the idea of this second-grade presidential campaign project when he asked the children one day to raise their hands if they thought they could never be a president. The answer broke his heart. Whaley says the project is about more than just learning to read and speak in public. He wants these kids to learn to boast (夸耀) about themselves.
“Boasting about yourself, and your best qualities,” Whaley says, “is very difficult for a child who came into the classroom not feeling confident.”
1. What made Chris nervous?A.Telling a story. | B.Making a speech. |
C.Taking a test. | D.Answering a question. |
A.Improper pauses. | B.Bad manners. | C.Spelling mistakes. | D.Silly jokes. |
A.help students see their own strengths |
B.assess students’ public speaking skills |
C.prepare students for their future jobs |
D.inspire students’ love for politics |
A.Humorous. | B.Ambitious. | C.Caring. | D.Demanding. |
7 . My mother is 92. Unless I have to be out of town, each week I take my mother to do her
Last week she walked up to the store, but when she went to pay for her groceries, she was
At this store, people
My mother was so
So, whoever you are, thank you for the random act of
A.exercise | B.housework | C.cooking | D.shopping |
A.reward | B.medicine | C.company | D.shelter |
A.return | B.collet | C.order | D.buy |
A.short | B.cautious | C.wrong | D.concerned |
A.aim | B.way | C.advice | D.reason |
A.weight | B.things | C.mask | D.glasses |
A.raise | B.add | C.bring | D.switch |
A.show up | B.call in | C.check out | D.sit down |
A.store | B.select | C.deliver | D.bag |
A.stranger | B.cashier | C.friend | D.doctor |
A.looked for | B.talked about | C.threw away | D.put back |
A.receipt | B.soap | C.cash | D.bottle |
A.asked | B.waited | C.cared | D.searched |
A.repay | B.trust | C.recognize | D.help |
A.luck | B.chance | C.gift | D.turn |
A.surprised | B.amused | C.touched | D.convinced |
A.in case | B.even if | C.as though | D.so that |
A.energy | B.money | C.space | D.time |
A.faith | B.courage | C.kindness | D.honor |
A.made her day | B.changed her mind | C.caught her eye | D.met her demand |
8 . As a businesswoman, I care deeply about my customers. But like anyone for whom you feel affection,
I remember the first really
That taught me a valuable
A.shopkeepers | B.customers | C.salespersons | D.receptionists |
A.saying | B.pretending | C.guessing | D.replying |
A.agree | B.promise | C.imagine | D.swear |
A.forget | B.decide | C.discover | D.assume |
A.foods | B.catalogues | C.belongings | D.goods |
A.particular | B.different | C.matching | D.natural |
A.fighting | B.smiling | C.waiting | D.changing |
A.generous | B.polite | C.careless | D.difficult |
A.curious about | B.displeased with | C.patient with | D.uncertain about |
A.relaxed | B.delighted | C.surprised | D.embarrassed |
A.searched | B.argued | C.prayed | D.apologized |
A.by chance | B.by herself | C.on purpose | D.on duty |
A.rude | B.such | C.other | D.lonely |
A.lesson | B.trick | C.skill | D.trade |
A.work | B.shop | C.meet | D.quarrel |
A.kindly | B.secretly | C.personally | D.casually |
A.ready | B.away | C.up | D.well |
A.out of sight | B.in the way | C.behind the scene | D.above the law |
A.stress | B.expect | C.handle | D.blame |
A.ruins | B.makes | C.starts | D.saves |
9 . Small children are easy to throw up in the air and catch-and they
I hope Jacky will always trust me fully, but I know that, as he gets
A.deserve | B.miss | C.love | D.know |
A.as if | B.in case | C.even though | D.so that |
A.fear | B.excitement | C.doubt | D.astonishment |
A.reasonable | B.limited | C.absolute | D.important |
A.relief | B.satisfaction | C.achievement | D.responsibility |
A.older | B.busier | C.quieter | D.healthier |
A.on my behalf | B.on my part | C.in my honor | D.in my name |
A.long-distance | B.high-risk | C.parent-child | D.teacher-student |
A.afford | B.choose | C.wait | D.expect |
A.attach | B.compare | C.adjust | D.introduce |
A.safe | B.happy | C.proud | D.grateful |
A.Above all | B.In addition | C.At first | D.For example |
A.admit | B.believe | C.suggest | D.imagine |
A.However | B.Therefore | C.Similarly | D.Fortunately |
A.affection | B.determination | C.friendship | D.leadership |
A.assess | B.organize | C.develop | D.understand |
A.repeat | B.follow | C.change | D.forget |
A.gesture | B.measure | C.bond | D.lack |
A.telling | B.giving | C.selling | D.sending |
A.management | B.personality | C.communication | D.education |
10 . Leslie Nielsen’s childhood was a difficult one, but he had one particular shining star in his life — his uncle, who was a well-known actor. The admiration and respect his uncle earned inspired Nielsen to make a career (职业) in acting. Even though he often felt he would be discovered to be a no-talent, he moved forward, gaining a scholarship to the Neighborhood Playhouse and making his first television appearance a few years later in 1948. However, becoming a full-time, successful actor would still be an uphill battle for another eight years until he landed a number of film roles that finally got him noticed.
But even then, what he had wasn’t quite what he wanted. Nielsen always felt he should be doing comedy but his good looks and distinguished voice kept him busy in dramatic roles. It wasn’t until 1980 — 32 years into his career — that he landed the role it would seem he was made for in Airplane! That movie led him into the second half of his career where his comedic presence alone could make a movie a financial success even when movie reviewers would not rate it highly.
Did Nielsen then feel content in his career? Yes and no. He was thrilled to be doing the comedy that he always felt he should do, but even during his last few years, he always had a sense of curiosity, wondering what new role or challenge might be just around the comer. He never stopped working, never retired.
Leslie Nielsen’s devotion to acting is wonderfully inspiring. He built a hugely successful career with little more than plain old hard work and determination. He showed us that even a single desire, never given up on, can make for a remarkable life.
1. Why did Nielsen want to be an actor?A.He enjoyed watching movies. | B.He was eager to earn money. |
C.He wanted to be like his uncle. | D.He felt he was good at acting. |
A.He directed some high quality movies. | B.He avoided taking on new challenges. |
C.He focused on playing dramatic roles. | D.He became a successful comedy actor. |
A.Art is long, life is short. | B.He who laughs last laughs longest. |
C.It’s never too late to learn. | D.Where there’s a will there’s a way. |