Controlling traffic is a complex and high cost problem in many developed countries. It becomes more difficult and costly with the ever- increasing number of cars on the roads. But scientists and students at the CATT, at the University of Maryland are working to solve this problem. They are using simulation(模擬) technologies to help government and private business control and react to changing traffic conditions.

The online economics magazine Forbes.com says traffic congestion(擁擠) cost Americans $ 124 billion in 2014 and that number could rise to $ 186 billion by 2030.

Bui scientists at the CATT lab are trying to reduce those costs. They are developing a system that helps traffic managers. planners, emergency workers and businesses plan and react better. Michael Pack is CATT director. He says the system is important to help emergency workers, or first responders，reach an accident area faster.

The CATT Lab collects information from many sources, including roadside devices, GPS (global positioning system) equipment and wireless phones.

About 60 students and 30 software developers observe traffic flow and manage the computer servers at all times. They also work to develop software and applications that can help traffic run smoother and safer, Some of them turn the information gathered into so-called "visualizations". These visual representations help emergency workers better understand what is happening.

The center shares its findings with firefighters, police，Transportation departments and the military. They also share information with universities and transportation company. The technology company Google uses the data for its traffic-related websites. Michael Pack says, the information is then shared with anyone who wants to help traffic run more smoothly.

Mr. Pack says the goal is to help develop an intelligent system of road signals that will communicate with each other and with vehicles on the road.

1.The second paragraph is written to

A. attract more people to look through Forbes.com.

B. tell readers what Forbes.com says on its website

C. show how much money controlling costs America

D. prove it is very expensive for some developed countries to control traffic

2.What benefit can emergency workers get from the system developed by the CATT lab?

A. They can be safer.

B. They can reach an accident area faster.

C. They can get more advice from people.

D. They can share their information with others.

3.Which of the following is NOT true about the developers and the students at the CATT?

A. They observe traffic flow continuously.

B. They develop software and applications.

C. They control the computer servers occasionally.

D. They change the information gathered into visual image.

4.1n which column of the newspaper can you read this text?

A. Daily life. B. Science. C. Education. D. Exploration.

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2014-2015學(xué)年重慶市高三上學(xué)期第一次月考英語試卷（解析版） 題型：完形填空

The carpenter I hired to help me restore an old farmhouse had just finished a rough first day on the joB． A flat tire made him_______an hour of work, his electric saw quit and now his ancient pickup truck refused to start,so I offered him a________．While I drove him home, he sat in stony silence．

On arriving, he invited me in to meet his family．As we walked together toward his house, he_________at a small tree by the front door, touching the branches with his hands．

The moment he opened the door, he had amusing_________．His eyes lit up and he ran to his two small children_________and hugged them and gave his wife a kiss．

After leaving the joyful family, I passed the tree and my_________got the better of me, so I asked, “Before we went in the house, _________did you stop by the tree?”

“Oh, that’s my trouble tree．” he replied, “I know I can’t_________having worries both on the job and in my life, but those_________don’t belong in the house with my wife and children．I know I can_________one thing for sure, so every night before I walk into my home I hang them up on the tree．”

“Funny thing is,” he_________, “when I come out in the morning to pick them up, there aren’t nearly as_________as I remember putting up the night before．”

1.A． lose B． find C． expect D． finish

2.A． tip B． ride C． car D． coffee

3.A． stared B． waved C． sat D． paused

4.A． expressions B． kids C． changes D． stories

5.A． willingly B． quietly C． carefully D． cheerfully

6.A． pity B． curiosity C． habit D． satisfaction

7.A． how B． when C． why D． what

8.A． keep B． help C． appreciate D． allow

9.A． problems B． jobs C． facts D． duties

10.A． correct B． remove C． learn D． control

11.A． admitted B． suggested C. insisted D． smiled

12.A． many B． good C． interesting D． free

查看答案和解析>>

科目：高中英語 來源：2016屆湖北省高三上學(xué)期12月月考英語試卷（解析版） 題型：閱讀理解

Across Britain, burnt toast will be served to mothers in bed this morning as older sons and daughters rush to deliver their supermarket bunches of flowers. But, according to a new study, we should be placing a higher value on motherhood all year.

Mothers have long known that their home workload was just as heavy as paid work. Now, the new study has shown that if they were paid for their parental labours, they would earn as much as £172,000 a year.

The study looked at the range of jobs mothers do, as well as the hours they are working, to determine the figure. This would make their yearly income £30,000 more than the Prime Minister earns.

By analyzing the numbers, it found the average mother works 119 hours a week, 40 of which would usually be paid at a standard rate 79 hours as overtime. After questioning 1,000 mothers with children under 18, it found that, on most days, mums started their routine work at 7 am and finished at around 11 pm.

To calculate just how much mothers would earn from that labour, it suggested some of the roles that mums could take on, including housekeeper, part-time lawyer, personal trainer and entertainer. Being a part-time lawyer, at £48,98 an hour, would prove to be the most profitable of the “mum jobs”, with psychologist(心理學(xué)家) a close second.

It also asked mothers about the challenges they face, with 80 per cent making emotional(情感的) demand as the hardest thing about motherhood.

Over a third of mums felt they needed more training and around half said they missed going out with friends.

The study shows mothers matter all year long and not just on Mother’s Day. The emotional, physical and mental energy mothers devote to their children can be never-ending, but children are also sources of great joy and happiness. Investing(投入) in time for parenting and raising relationships is money well spent.

1.How much would a mother earn a year if working as the Prime Minister?

A. £30,000. B. £142,000.

C. £172,000. C. £202,000.

2.The biggest challenge for most mothers is from .

A. emotional demand

B. low pay for work

C. heavy workload

D. lack of training

3.What is stressed in the last paragraph?

A. mothers’ importance shows in family all year long.

B. The sacrifices mothers make are huge but worthwhile.

C. Mothers’ devotion to children can hardly be calculated.

D. Investing time in parenting would bring a financial return.

4.What can we conclude from the study?

A. Mothers’ working hours should be largely reduced.

B. Mothers should balance their time for work and rest.

C. Mothers’ labour is of a higher value than it is realized.

D. Mothers should be freed from housework for social life.

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年江蘇泰州姜堰高三上期中英語試卷（解析版） 題型：單項(xiàng)填空

— Are you in favour of Tom’s suggestion_______ we work around the clock to meet the deadline?

— No．But ______ Jimmy suggested to me sounds practical.

A． which; what B． that; that

C． which; that D． that; what

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年貴州遵義航天高級(jí)中學(xué)高三上第四次模擬英語試卷（解析版） 題型：閱讀理解

If English means endless new words，difficult grammar and sometimes strange pronunciation，you are wrong．Haven't you noticed that you have become smarter since you started to learn a language?

According to a new study by a British university，learning a second language can lead to an increase in your brain power．Researchers found that learning other languages changes grey matter．This is the area of the brain which processes information．It is similar to the way that exercise builds muscles．

The study also found the effect is greater，the younger people learn a second language．

A team led by Dr Andrea Mechelli，from University College London，took a group of Britons who only spoke English．They were compared with a group of "early bilinguals" who had learnt a second language before the age of five，as well as a number of later learners．

Scans showed that grey matter density (密度) in the brain was greater in bilinguals than in people without a second language．But the longer a person waited before mastering a new language，the smaller the difference．

"Our findings suggest that the structure of the brain is changed by the experience of learning a second language," said the scientists．

It means that the change itself increases the ability to learn．

Professor Dylan Vaughan Jones of the University of Wales，has researched the link between bilingualism and maths skills．"Having two languages gives you two windows on the world and makes the brain more flexible (靈活的),"he said．"You are actually going beyond language and have a better understanding of different ideas．"

The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of two and 34．Reading，writing，and comprehension were all tested．The results showed that the younger they started to learn，the better．"Studying a language means you get an entrance to another world," explained the scientists．

1.The main subject talked about in this passage is ______．

A． science on learning a second language

B． man’s ability of learning a second language

C． 1anguage can help brain power

D． 1anguage learning and maths study

2.In the second paragraph，the writer mentions “exercise” in order to ______．

A． say language is also a kind of physical labor

B． prove that one needs more practice when he (she) is learning a language

C． to show the importance of using the language when you learn the language

D． make people believe language learning helps grey matter work well

3.The underlined word “bilingual'’ probably means ______．

A． a researcher on language learning

B． a person who is good at learning foreign languages

C． a person who can speak two languages

D． an active language learner

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年四川眉山中學(xué)高一上學(xué)期半期英語試卷（解析版） 題型：單項(xiàng)填空

— Father, you promised!

— Well, ________. But it was you who didn’t keep your word first.

A. So was I. B. So did I. C. So I was. D. So I did.

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年甘肅積石山積石中學(xué)高一上10月月考英語試卷（解析版） 題型：完形填空

The two teachers were sitting in the teacher’s room．For a moment there was ．Then one of them, Miss Smith said “I’m afraid I’d have to him．”

“Now, Alice,” said her friend Mrs．Jackson, “is he such a terrible student?”

“That’s just the ,” the other woman replieD． “Tom is my best student．The problem is that he’s now so lazy that he never gets done．He hasn’t handed me of his homework for three weeks and I’d be surprised he did now．”

before had Mrs．Jackson seen Miss Smith look so unhappy．“Have you with him about it?” she askeD．

“Why should I? He knows he has to prepare his lessons and do his homework．I that clear the first day for class．When the course started , he did so that I considered asking the to give him a scholarship (獎(jiǎng)學(xué)金)．But now he even in class! I’ve never seen such a in a student．”

“You should have a with him．Give him a chance to tell his side of story．”

Miss Smith spoke to Tom and all about it．He was studying all day and most of the night in a factory to pay for his education．Of course he was tired in the and sometimes could hardly keep ．Miss Smith soon arranged for him to have a and he was able to give up his and concentrate (集中精力) on his studies ．

1.A． distance B． silence C． pleasure D． delight

2.A． fail B． teach C． beat D． tell

3.A． lesson B． thing C． trouble D． boy

4.A． homework B． housework C． cleaning D． washing

5.A． some B． plenty C． any D． lots

6.A． even B． if C． though D． when

7.A． Long B． Until C． Ever D． Never

8.A． quarreled B． talked C． dealt D． discussed

9.A． said B． thought C． required D． made

10.A． quickly B． often C． much D． well

11.A． school B． class C． others D． parents

12.A． talks B． sleeps C． laughs D． walks

13.A． matter B． change C． habit D． way

14.A． lesson B． look C． talk D． meeting

15.A． studied B． got C． learned D． understood

16.A． sleeping B． working C． spending D． staying

17.A． morning B． afternoon C． evening D． night

18.A． silent B． clean C． warm D． awake

19.A． scholarship B． room C． teacher D． position

20.A． education B． sleep C． job D． pay

查看答案和解析>>

科目：高中英語 來源：2016屆北京通州區(qū)潞河中學(xué)高三上學(xué)期期中英語試卷（解析版） 題型：完形填空

閱讀下面短文，掌握其大意，從每題所給的A、B、C、D四個(gè)選項(xiàng)中，選出最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。

Joy to the World

Lights, decorations and Christmas trees filled the stores. Many people were there because Christmas was only two days away.

Thirteen-year-old Joy had just her Christmas shopping. She knew her parents, grandparents so well that finding them was a piece of cake.

Joy went out of the store and came across her classmate, Nick, the least student in school because he wore strange clothing and he had a face only a mother could love.

“What are you doing for Christmas?” said Nick with a smile that showed all his yellow teeth.

“I’m opening presents and having dinner with my ,” said Joy, trying to be polite. “What about you?”

“My parents are away,” he said. “I live with my uncle, who doesn’t like me very much.”

Joy wasn’t sure how to , so she said goodbye with an awkward smile. She felt sorry for Nick since he must feel . But that wasn’t really her problem.

On Christmas Eve, Joy’s family were busy around for the holiday. Joy’s parents were cooking in the kitchen. Joy was a child for holiday cheer, dancing the house.

After dinner, the family into their car and headed to church for the Christmas Eve service. When they walked into the old building, they were by the flow of beautiful songs. A man stood up with Bible and the story Joy had learned on her mother’s knee. It was about a baby named Jesus who came to live on Earth to help people who him.

Joy’s thoughts kept turning back to Nick. It must be to be lonely on Christmas, a day that celebrated God’s Son coming to Earth. Tears started to run down her , but she brushed them away.

Joy lay awake that night everyone else was sleeping like a baby. She was thinking ways to help Nick. As soon as she heard parents get up, she out of bed. She found them in the kitchen and told them about Nick. Then she asked, “Can we him over today?” “Sure,” said her mother, who was always happy when came. Her father smiled.

When Joy called Nick later that day, he was excited. After getting his uncle’s , he joined them for dinner. To her surprise, Joy enjoyed spending time with him.

Joy came to understand Christmas cheer is a joy to Nick, even to the whole world.

1.A. mentioned B. finished C. prepared D. remembered

2.A. presents B. trees C. lights D. toys

3.A. smart B. brilliantC. popular D. interesting

4.A. friends B. classmates C. colleagues D. family

5.A. remind B. respondC. command D. correct

6.A. surprised B. happy C. lonely D. guilty

7.A. applying B. preparing C. calling D. paying

8.A. beyondB. for C. on D. around

9.A. piled B. looked C. ran D. flew

10.A. surroundedB. heard C. frightened D. introduced

11.A. repeatedB. made C. recorded D. read

12.A. attendedB. taught C. helped D. needed

13.A. unexpectedB. joyful C. terrible D. delighted

14.A. head B. cheeks C. eyes D. mouth

15.A. if B. since C. while D. because

16.A. jumped B. ran C. kept D. took

17.A. invite B. requestC. please D. let

18.A. classmatesB. guests C. teachers D. leaders

19.A. appreciationB. consideration C. punishment D. permission

20.A. enjoying B. getting C. sharing D. creating

查看答案和解析>>

科目：高中英語 來源：2016屆云南師大附中高考適應(yīng)性月考卷三英語試卷（解析版） 題型：完形填空

完形填空

One day in 11th grade, when I went into a classroom to wait for a friend of mine, Mr. Washington, the math teacher, suddenly and asked me to go to the board to write down a math problem and it out. I told him that I couldn’t do it. And he asked, “Why not?” I said, “Because I’m not one of your students.” He said, “It doesn’t matter. Go the board .” I said, “I can’t do that.” He asked, “Why not?” I paused for I was somewhat

I said, “Because I’m the so called student.” He

He came from behind his desk and looked at me and said. “Don’t ever say that again. Someone’s opinion of you does not have to become your . Look at a man the that he is, he only becomes worse. But look at him he were what he could be, then he becomes what he should br.” It was a very moment for me. For one thing, I was because the other students me. They knew that I was “incurably poor” in academic learning. But for another, I felt because he began to bring to my attention that I did not have to live within the of other people.

Mr. Washington’s words made difference to me. I start to believe everyone has certain________ within them, and so in me. I used to do in the fifth grade and was put from the fifth grade into the fourth grade and then failed again in the eighth grade. But I know all these in the past. So I’m happy to that I’m a brand new person now and I will be someone who can something in the future.

1.A. turned on B. turned up C. turned down D. turned over

2.A. set B. write C. settle D. work

3.A. anyway B. anymore C. somehow D. somewhat

4.A. guilty B. optimistic C. embarrassed D. ambitious

5.A. incurable B. innocent C. excellent D. independent

6.A. eagerly B. mistakenly C. happily D. determinedly

7.A. nature B. reality C. stability D. ability

8.A. person B. character C. way D. future

9.A. even though B. if only C. as if D. even if

10.A. inspiring B. frightening C. disappointing D. unwilling

11.A. pleased B. ashamed C. puzzled D. confused

12.A. pointed at B. stared at C. laughed at D. glared at

13.A. relieved B. scared C. concerned D. stressed

14.A. variety B. enthusiasm C. judgment D. complaint

15.A. no B. huge C. less D. little

16.A. thoughts B. shortcomings C. greatness D. limits

17.A. poorly B. randomly C. carefully D. attentively

18.A. refreshed B. died C. approved D. formed

19.A. pretend B. expect C. insist D. admit

20.A. accomplish B. assess C. supply D. remove

查看答案和解析>>

同步練習(xí)冊(cè)答案