In the 1960s Professor Bolin predicted (预测) that the “greenhouse effect”, caused by an increase in the amount of carbon dioxide (CO2) in the atmosphere, would lead to important changes in the Earth’s climate. At the time his prediction were regarded as science fiction. But it is now gradually agreed that the amount of carbon dioxide in the atmosphere will double from 0.03% to 0.06% in the next 50 years and that temperatures worldwide will rise by 2°C.
Although a temperature rise of 2° may not seem significant, the local effects may be much greater: in polar regions a rise of 10° by 2025 is expected and in Northern Europe a rise of 4°. Indeed the first effects were expected to be felt before the end of the 20th century.
But how does the “greenhouse effect” operate and why should such a tiny proportion (比例) of CO2 have such a harmful effect? When living creatures breathe out or when things are burned, CO2 enters the atmosphere. Until recently all of this was absorbed by plants, which converted (转化) it back into oxygen.
However, the balance of nature has been disturbed. In power stations, in factories and in our cars, we are burning more and more fossil fuels (coal, oil and natural gas) and this produces huge quantities of CO2—18 billion tons of it enter the atmosphere every year. Added to this, the destruction of forests means that less CO2 can be converted into oxygen by plants. So, the amount of CO2 in the atmosphere is increasing every year.Which of the following statements is true according to the passage?
| A．Only a small portion of the atmosphere consists of carbon dioxide. |
| B．Professor Bolin’s predictions were taken seriously in the first place. |
| C．No changes in climate will become noticeable for 50 years or more. |
| D．The rise in temperature will probably be 2 degrees in every part of the world. |
The amount of CO2 in the atmosphere is increasing every year because .
| A．Carbon dioxide is produced when we breathe. |
| B．Carbon dioxide is produced when we burn things. |
| C．More forests are destroyed and more fossil fuels are burned. |
| D．The global temperature keeps rising. |
The underlined word “operate” in the third paragraph most probably means “ ”.
| A．play | B．move |
| C．manage | D．function |
Jenny found her old bicycle at the back of the garage．It was a lot smaller than she remembered．When she sat on it and put her feet on the pedals，her knees nearly touched her chin. She then asked her dad for a new bicycle．
“Well，I’m sorry，but I can’t afford a bicycle now，“said Dad．“Why don’t you work and earn some money? You can save up for a bicycle yourself．”
Jenny began to work．That day she earned five dollars for cutting the grass and ten dollars for mowing the lawn for her dad．
That night Jenny went on the computer．She wrote“Gardening and Housework—Ten dollars an hour．Call Jenny at 23 Roseville Lane．“She decorated the page with pictures of cleaning and gardening equipment．She printed it fifty times．Then she posted the pages through all the doors on her street．
That week，Jenny was very busy! Lots of people had jobs to do，but they didn’t have time to do them．So they called Jenny．Every day，Jenny rushed home from schoo1．She did her homework quickly，and then she went out to work．
At the end of the week．she had$65! She told her father．
“That’s enough for a second hand bicycle.”he said．
“Yes，but if I work for one more week，I might have enough money for a new bike，“said Jenny．“In two more weeks，I could buy a really good bicycle! I think that's what I'll do. I want to have the best bicycle in the class，because I earn it myself!”
Jenny’s dad hugged her．“I think you learned something important．We appreciate things a lot more when we earn them．When we get something without earning it，we do not realize its true value．”What was the problem with Jenny’s old bicycle?
| A．It was broken． | B．It was too small． |
| C．Jenny didn't like it． | D．It was too dirty． |
Why didn’t Jenny’s dad buy her a bicycle?
| A．He had just bought Jenny a birthday present. |
| B．He was too busy． |
| C．He wanted to teach her a lesson． |
| D．He didn’t think it was a good idea． |
How much money did Jenny earn on the first day?
| A．＄10． | B．＄15． | C．＄65． | D．＄5． |
How did Jenny tell her neighbors about her new business?
| A．She mailed letters to them． | B．She talked to all her neighbors． |
| C．she sent them an email． | D．She delivered messages by hand． |
We can infer from Jenny’s words at the end of the story that she was ___________．
| A．optimistic about making more money |
| B．grateful to her father for his advice |
| C．pleased because she had learnt a useful lesson |
| D．disappointed because she couldn’t afford a new bicycle |
Goldie's Secret
She turned up at the doorstep of my house in Cornwall. No way could I have sent her away. No way, not me anyway. Maybe someone had kicked her out of their car the night before. "We're moving house.'; "No space for her any more with the baby coming." "We never really wanted her, but what could we have done? She was a present." People find all sorts of excuses for abandoning an animal. And she was one of the most beautiful dogs I had ever seen.
I called her Goldie. If I had known what was going to happen I would have given her a more creative name. She was so unsettled during those first few days. She hardly ate anything and had such an air of sadness about her. There was nothing I could do to make her happy, it seemed. Heaven knows what had happened to her at her previous owner's. But eventually at the end of the first week she calmed down. Always by my side, whether we were out on one of our long walks or sitting by the fire.
That's why it was such a shock when she pulled away from me one day when we were out for a walk. We were a long way from home, when she started barking and getting very restless. Eventually I couldn't hold her any longer and she raced off down the road towards a farmhouse in the distance as fast as she could.
By the time I reached the farm I was very tired and upset with Goldie. But when I saw her licking (舔) the four puppies (幼犬) I started to feel sympathy towards them. "We didn't know what had happened to her," said the woman at the door. "I took her for a walk one day, soon after the puppies were born, and she just disappeared." "She must have tried to come back to them and got lost," added a boy from behind her. '
I must admit I do miss Goldie, but I've got Nugget now, and she looks just like her mother. And I've learnt a good lesson: not to judge people.In her first few days at the author's house, Goldie .
| A．felt worried | B．was angry |
| C．ate a little | D．sat by the fire |
Goldie rushed off to a farmhouse one day because she .
| A．saw her puppies | B．heard familiar barking |
| C．wanted to leave the autho | D．found her way to her old home |
The passage is organized in order of .
| A．time | B．effect | C．importance | D．complexity |
Knowing the best way to study will help you to be a better student. By using your time properly, you can do your homework more quickly. Learning to study is not difficult.
The first thing to remember is that you must be willing to learn. It doesn’t mean that you must always like the subject. It does mean, however, that you must be wil1ing to do whatever is necessary to learn. Try to understand why it is important and how it will help you now and later to do and learn other things. Knowing mathematics facts will be useful in your whole life. Knowing how to spell makes any kind of writing easier. Sometimes the subject that you think is going to be uninteresting will be exciting when you begin to work at it and understand it more clearly. Learning things can be fun if you are willing to work with them.
Here’s some advice for you: have a certain time each day and a quiet place with good lighting for study, so that you can concentrate on your study without interruptions(中断); have everything ready before you sit down to study, a dictionary, paper, a pen and books; be sure you understand what you should learn before you start; read carefully and pay special attention to the most important things; when memorizing, first find out the main parts and then recite the whole thing; check your homework after you finish it; never forget the importance of review and preview.
Don’t try to spend a lot of time researching learning methods. There are many students who know many good learning methods but don’t study well. They forget that the most useful learning method is to study hard.The main goal of the article is .
| A．to prove that learning is not difficult |
| B．to make the readers be interested in study |
| C．to tell the importance of self teaching |
| D．to tell the students how to study well |
The first thing to remember in studying is that .
| A．you must like the subject | B．you must follow the teacher |
| C．you must enjoy learning | D．you must study hard |
We learn things because .
| A．our parents want us to learn | B．every student learns at school |
| C．we may use these things in the future | D．we like the subjects |
The following advice is given in the article EXCEPT .
| A．To put a pen, paper and books beside you before study. |
| B．To study at any possible time and place. |
| C．To review and preview |
| D．To pay attention to the most important things. |
Among the following statements, which is true?
| A．The more learning methods we have, the better we will study. |
| B．Finding the best learning method is the most important in learning. |
| C．If you don’t work hard, though you have a good learning method, you can’t be good at study. |
| D．Once we have mastered a good learning method, we can improve our study greatly. |
All of us eat every day, but most of us don’t understand nutrition(营养). How much do you know about good nutrition? Are the following statements true or false?
1. People who don’t eat meat can stay healthy.
True. As long as people eat enough milk, eggs and meat alternates(替代物), they can get enough protein.
2. Fresh vegetables cooked at home are always more nutritious than canned vegetables.
False. The difference depends more on how vegetables are prepared than whether they are fresh or canned. Vegetables cooked in too much water can lose a large quantity of vitamins.
3. Food eaten between meals can be just as good for health as food eaten at regular meals.
True. Nutritional value depends on what types of food you eat, not when you eat them. Eating an egg or an orange between meals can contribute to a good diet.
4. Taking extra vitamins beyond the recommended daily allowances won’t give you more energy.
True. It’s widely believed that extra vitamins provide more energy. But taking more than the baby needs doesn’t make it function better, just as overfilling your gas tank doesn’t make your car run better.
5. Natural vitamins are better supplements(补充)for the diet than synthetic vitamins.
False. There is no difference. A vitamin has the same properties(性质)and specific chemical structure whether made in a laboratory or taken from plant or animal parts.
6. Older people need the same amount of vitamins as younger people.
True. Older people need the same quantity of vitamins as younger people although they need fewer calories. Certain illnesses raise the requirements for some vitamins, but that is true for the young as well as the old.
7. Food grown in poor soil is lower in vitamins than food grown in rich sold.
False. The vitamins in our foods are made by the plants themselves. They don’t come from the soil.
However, the minerals in a plant depend on the minerals in the soil.
If you have answered these questions correctly, you can say you know much about food and nutrition by today’s standards. But remember that nutrition is a growing science and that may be aged as new information is obtained.The main purpose of the passage is to .
| A．list today’s standards of some food and nutrition |
| B．introduce what should be eaten and what not |
| C．explain what is helpful to your health and what is not |
| D．test our nutrition IQ by judging the problems listed |
From the surrounding words and sentences we know that the underlined phrase “contribute to” means .
| A．help to bring about | B．take the place of |
| C．make room for | D．turn to |
The underlined word “synthetic” most probably meansin Chinese.
| A．不同的 | B．特别的 |
| C．合成的 | D．天然的 |
Global Positioning Systems（GPS） are now a part of everyday driving in many countries. These satellite-based systems provide turn-by-turn directions to help people get to where they want to go. But, they can also cause a lot of problems, send you to the wrong place or leave you completely lost. Many times, the driver is to blame. Sometimes a GPS error is responsible. Most often, says Barry Brown, it is a combination of the two.
We spoke to Mr. Brown by Skype （网络电话软件）. He told us about an incident involving a friend who had flown to an airport in the eastern United States. There he borrowed a GPS-equipped car to use during his stay. BARRY BROWN: “And they justpluggedin an address and then set off to their destination. And, then it wasn’t until they were driving for thirty minutes that they realized they actually put in a destination back on the West Coast where they lived. They actually put their home address in. So again, the GPS is kind of 'garbage in garbage out'.”
Mr Brown says this is a common human error. But, he says, what makes the problem worse has to do with some of the shortcomings, or failures, of GPS equipment. BARRY BROWN: “One problem with a lot of the GPS units is that they have a very small screen and they just tell you the next turn. Because they just give you the next turn, sometimes that means that it is not really giving you theoverviewthat you would need to know that it’s going to the wrong place.”
Barry Brown formerly served as a professor with the University of California, San Diego. While there, he worked on a project with Eric Laurier from the University of Edinburgh. The two men studied the effects of GPS devices on driving by placing cameras in people’s cars. They wrote a paper based on their research. It is called “The Normal, Natural Troubles of Driving with GPS.”
It lists several areas where GPS systems can cause confusion for drivers. These include maps that are outdated, incorrect or difficult to understand. They also include timing issues(时机问题) related to when GPS commands are given.
Barry Brown says, “ To make GPS systems better we need a better understanding of how drivers, passengers and GPS systems work together.”In paragraph 2, Mr. Brown mentioned his friend in the conversation to _______.
| A．build up his own reputation |
| B．laugh at his stupid friend |
| C．prove the GPS system is only garbage |
| D．describe an example of human error |
What is the disadvantage of small screens in GPS equipment according to the text?
| A．They just provide the next turn. | B．They are harmful to eyes. |
| C．They make drivers tired easily. | D．They often break down suddenly. |
Which of the following statements would Barry Brown most likely agree with?
| A．GPS units are to blame for most GPS service failures. |
| B．We should introduce higher standards for the driving license. |
| C．Cameras are urgently needed to help improve GPS systems. |
| D．Drivers, GPS systems and passengers should unite to improve GPS systems. |
What is Mr. Brown’s attitude towards GPS?
| A．Unconcerned. | B．Prejudiced. |
| C．Objective. | D．Critical. |
Which of the following statements can best describe the main idea of the pasage?
| A．Driving with GPS can be difficult. |
| B．Driving confusions can be caused by small screens. |
| C．Driving without GPS should be much more convenient. |
| D．GPS equipment in driving to be deserted or improved |