Scientists have long understood the key role that oceans play in regulating the Earth’s climate. Oceans cover 70 percent of the globe and store a thousand times more heat than the atmosphere does. What’s newer is the understanding of how this key component of our climate system responds to global warming.
A brake on global warming — for now
One of oceans’most important climate functions is absorbing heat and carbon dioxide (CO2), one of the gases that cause global warming. Acting as a heat sponge (海绵), oceans have absorbed huge amounts of heat and CO2 in the last forty years.
Fujita explains that "oceans are saving us from faster climate change — they are a big flywheel that delays rapid overheating of the Earth, putting a brake on the climate system."
"That’s the good news," he adds. "The bad news is that oceans only slow the atmospheric warming. Once oceans come to balance with a greenhouse gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter." But where and how oceans release this accumulated (积累的) heat is uncertain. And as oceans store heat, fragile underwater ecosystems are struggling.
The most recent scientific report from the Intergovernmental Panel on Climate Change (IPCC) also notes with concern that oceans are acidifying because of increased absorption of atmospheric CO2, and thus causing a threat for shell-forming species. Sharp increases in carbon dioxide levels will cause further acidification of oceans.
Currents distributing heat
Another important role oceans play is that of distributor. Oceans deliver heat and life-sustaining nutrients around the globe. Just as blood vessels bring oxygen and nutrients to cells in the human body, oceans’ currents carry oxygen, nutrients and heat throughout the Earth. Oceans distribute 25 percent to 50 percent of the energy the planet receives from the sun. For example, the Gulf Stream carries heat across the Atlantic. This warm current gives northwestern Europe a milder climate than it would normally have so far north. A change to oceans’ circulation (循环) patterns could throw Europe into a colder period, even as the rest of world experiences warmer temperatures.
This passage mainly talks about .
A.the roles of oceans B.global warming
C.ocean currents D.carbon dioxide
Computer programmer David Jones earns $35.000 a year designing new computer games. yet he cannot find a bank ready to let him have a credit card（信用卡）Instead he has been told to wait another two years until he is 18. The 16-year-old works for a small firm in Liverpool where the problem of most young people of his age is finding a job David’s firm releases（推出）two new games for the fast growing computer market each month
But David’s biggest headache is what to do with his money. Even though he earns a lot he cannot drive a car take out a mortgage（抵押贷款）,or get credit cards David got his job with the Liverpool-based company four months ago ,a year after leaving school with six O-levels and working for a time in a computer shop. “I got the job because the people who run the firm knew I had already written some programs” he said David spends some of his money on records and clothes and gives his mother 50 pounds a week But most of his spare time is spent working.
“Unfortunately, computing was not part of our studies at school “ he said “But I had been studying it in books and magazines for four years in my spare time I knew what I wanted to do and never considered staying on at school Most people in this business are fairly young, anyway” David added :”I would like to earn a million and I suppose early retirement（退休）is a possibility You never know when the market might disappear.”In what way is David different from people of his age?
| A．He often goes out with friends |
| B．He lives with his mother |
| C．He has a handsome income |
| D．He graduated with six O-levels |
What is one of the problems that David is facing now?
| A．He is too young to get a credit card |
| B．He has no time to learn driving |
| C．He has very little spare time |
| D．He will soon lose his job |
Why was David able to get the job in the company?
| A．He had done well in all his exams |
| B．He had written some computer programs |
| C．He was good at playing computer games |
| D．He had learnt to use computers at school |
Why did David decide to leave school and start working?
| A．He received lots of job offers |
| B．He was eager to help his mother |
| C．He lost interest in school studies |
| D．He wanted to earn his own living |
I suddenly heard an elephant crying as though frightened Looking down I immediately recognized that something was wrong and ran down to the edge of the near bank There I saw Ma Shwe with her three-month-old calf struggling in the fast-rising water and it was a life-and-death struggle Her calf was floating and screaming with fear Ma Shwe was as near to the far bank as she could get, holding her whole body against the rushing water and keeping the calf pressed against her huge body . Every now and then the rushing water would sweep the calf a way.
There was a sudden rise in the water and the calf was washed clean over the mother’s body and was gone Ma Shwe turned quickly to reach it and pressed the calf with her head and trunk（象鼻）against the rocky bank Then with a huge effort she picked it up in her trunk and tried until she was able to place it on a narrow shelf of rock
Just at this moment she fell back into the river If she were carried down it would be certain death I knew as well as she did ,that there was one spot（地点）where she could get up the bank but it was on the other side from where she had put her calf
While I was wondering what I could do next I heard the sound of a mother’s love Ma Shwe had crossed the river and got up the bank and was making her way back as fast as she could roaring（吼叫）all the time but to her calf it was music.The moment the author got down to the river bank he saw______.
| A．the calf was about to fall into the river |
| B．Ma Shwe was placing the calf on the rock |
| C．the calf was washed away by the rising water |
| D．Ma Shwe was holding the calf against the rushing water |
How did Ma Shwe manage to save her calf from the fast-flowing water?
| A．By putting it on a safe spot |
| B．By pressing it against her body |
| C．By taking it away with her |
| D．By carrying it on her back |
How did the calf feel about the mother elephant’s roaring?
| A．It was a great comfort | B．It was a sign of danger |
| C．It was a call for help | D．It was a musical note |
What can be the best title for the text?
| A．A Mother’s Love | B．A Brave Act |
| C．A Deadly River | D．A Matter of Life and Death |
Abby Subark is a mother of two from Boston. “For my kids, I’m nervous. I don’t know if they’ll be able to achieve their American dream.” She may be right. More than hard work or education, the best way to get rich in America is to be born rich.
It is the case that somebody who is in the upper third of income, poor scores, in the bottom on tests when they are in eighth grade, is more likely to go to college and finish college than a poor kid with the top scores. That’s what the working persons’ children are up against.
The Economic Policy Institute finds it would take a poor couple with 2 children 9 or 10 generations to achieve middle class status. That’s about 200 years. The hallmark (特征) of American opportunity has always been the ability to do better than your parents. But compared with similar developed countries, the United States ranks fifth out of six for so-called intergenerational mobility (变动).
If you look at the mechanisms (机制) for upward mobility that were so readily available 50 years ago, they are becoming out of reach, like plentiful factory jobs with good wages and affordable education and health care.
White families are twice as likely as blacks to be upwardly mobile. For most people in America today, where you end up depends on where you start.
If you started in the middle-income class, about 40 to 45 percent of what you are making right now is due to the fact that your parents were in the middle-income class. The rest is up to you.
But for the millions of people who find themselves below the poverty line and the millions more who are the working poor, their starting point for the American dream leaves them painfully far away from the middle class. The main idea of the passage is _______.
| A．How the middle class comes about in the U.S. |
| B．It’s hard to realize the American dream for the poor. |
| C．Wealth and social status depend on family background. |
| D．Upward mobility in America is never easy. |
Which of the statements is NOT true according to the passage?
| A．People used to have job opportunities and welfare for upward mobility. |
| B．A great many poor people can hardly realize their American dream. |
| C．You can make all your dreams come true in America if born rich. |
| D．Rich kids are more likely to go to college than poor kids. |
The underlined sentence “where you end up depends on where you start” most probably means _______.
| A．Your starting point cannot determine your destination. |
| B．Only a high goal can ensure success. |
| C．One’s birth has nothing to do with his fate. |
| D．One’s family lays solid foundation for his future achievements. |
Why is Abby Subark nervous?
| A．Her kids don’t want to compare with other rich kids in achievements. |
| B．Her kids don’t want to achieve success at all. |
| C．Her kids can achieve success through hard work and education. |
| D．Her kids can’t reach their goal without a rich family. |
What can we infer after reading the passage?
| A．Poverty causes people much pain. |
| B．People below the poverty line can never be in the middle class. |
| C．Lower starting point makes it hard for people to realize their dream. |
| D．Poor people’s starting point is too low. |
Everyone’s at it, even my neighbors. I thought I might be the only person left in the world who hadn’t done an eBay deal. So, I decided to try my hand at online auction（网上拍卖）.
Buying for Beginners
Sign up on www. eBay. co. uk. Most items (e.g. tables, computers and books) ready for auction will come with a picture and a short description; others may be marked with “Buy It Now” and have a fixed price. You can buy these right away.
If the item is being auctioned, you offer the highest price you are prepared to pay and eBay bids (出价) for you. The bid will be increased little by little until it goes beyond your highest bid, then you are emailed and asked if you would like to bid again. Auctions last up to 10 days and when they finish, you get an email telling you whether you have won the item. 
How to Pay
Sellers decide how they would like to be paid and you need to check this before placing a bid as you might not want to post a check or postal orders. The easiest way is through PayPal, an online payment system that takes the money away from your credit card.
Selling Made Simple
If you plan to sell on eBay, it helps to include a picture of the item. I followed my friends’ advice and put up the items I wanted to sell for a 10-day auction, starting on a Thursday. This way buyers had two weekends to bid.
The big Things in Life
It’s easy to post a small item, but furniture is a big part of eBay and this has to be collectively sent by deliverymen. Check the ways of delivery before you bid.What is the passage mainly about?
| A．How to make payment online. | B．Ways of making delivery online. |
| C．Advantages of an online auction system. | D．How to use an online-auction system. |
After bidding for an item, a buyer ________.
| A．has chances to make higher bids | B．will get what he wants in ten days |
| C．should make payment immediately | D．may check its picture and description |
The easiest way of making payment mentioned in the passage is ________.
| A．through a local banking system | B．by sending the money to the seller |
| C．by paying the deliveryman directly | D．through an online payment system |
In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a checklist of stressful events. They found out that any major change can be stressful. Negative events like “serious illness of a family member” were high on the list, but so were some positive life-changing events, like marriage. When you take the Holmes-Rahe test you must remember that the score does not show how you deal with stress—it only shows how much you have to deal with. And we now know that the way you deal with these events has a great effect on your chances of staying healthy.
By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women's magazines ran headlines like “Stress causes illnesses”.If you want to stay physically and mentally healthy, the articles said, avoid stressful events. But such simplistic advice is impossible to follow. even if stressful events are dangerous, many—like the death of a loved one—are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription(处方) for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted to be completely free of stress would never marry, have a child, take a new job or move.
The idea that all stress makes you sick also takes no notice of what we know about people. It is supposed that we're all weak and passive in the face of difficulty. But many come through periods of stress with more physical and mental strength than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and mental damage.The result of Holmes-Rahe’s medical research tells us _______.
| A．what should be done to avoid stress |
| B．the way of dealing with major events may cause stress |
| C．what kind of event would cause stress |
| D．how to deal with sudden changes in life |
The studies on stress in the early 1970's led to_______.
| A．great fear about the mental problems it could cause |
| B．widespread worry over its harmful effects |
| C．a deep research into illnesses connected with stress |
| D．popular avoidance of stressful jobs |
According to the passage people who have experienced ups and downs may become___.
| A．discouraged when faced with difficulty |
| B．physically and mentally weak |
| C．more experienced in the face of difficulty |
| D．uninterested in what happens to them |
What’s the purpose of writing the text?
| A．To tell people the discoveries about stress. |
| B．To tell people how to keep healthy. |
| C．To help people avoid stressful events. |
| D．To help people view stress properly. |