A 33-year-old financial analyst in California recently quit his job to devote himself to an unpaid job teaching math on the Internet, and his lessons are reaching almost 100,000 people a month. Sal-man Khan's voice is heard every day on the net—by tens of thousands of students around the world who are hungry for help in learning math. He has posted 1,200 lessons on YouTube—lessons that appear on an electronic blackboard, which range from basic addition to advanced mathematics for science and finance. And they are free.
Khan lives in Silicon Valley, with his wife, a doctor, and their new baby. He got the idea for his “Khan Academy" four years ago, when he taught a young cousin how to convert (转换)kilograms to grams. With Khan's help, the cousin got good at math, and Khan began a new career.
Now, Khan records his lessons himself, but he never goes on camera. “It feels like my voice in their head. You're looking at it and it feels like someone's over your shoulder talking in your ear, as opposed to someone at the blackboard, which is distant from you,” he said.
When Springfield High School in Palo Alto, California invited Khan to speak in person—he immediately connected to the students there.
The idea of short lessons that can be played over and over again attracted high school senior Bridget Meaney. She says she had trouble with math in the seventh grade. “I think the teachers are good, but they can't teach at a speed that's perfect for everyone,” she said. “I like the idea of learning something in class but then going back and pressing pause or rewind (倒回)and actually getting a deeper understanding of it. ”
Originally, Khan kept his lessons short because of YouTube restrictions (限制). Now, he thinks short is better. “Education researchers now tell me that 10 minutes is how long someone can have a high level of concentration. And anything beyond that and your brain switches off,"he said.
For Khan, teaching math, science, and finance is just the beginning. He says he's ready to expand his YouTube site to include other subjects as well. What gave Khan the idea of teaching math online?
A.His success in helping his cousin learn math. |
B.His discovery that many students found learning math difficult. |
C.A suggestion made to him at a local high school. |
D.His interest in Internet teaching. |
Why does Khan never go on camera?
A.He's too shy to show his face on camera. |
B.It's restricted by YouTube for education videos. |
C.He wants to keep distant from the viewers. |
D.He wants to create a more relaxed learning atmosphere. |
Why does Bridget Meaney like Khan's lessons?
A.Khan teaches seventh grade math better than her teacher. |
B.The lessons can be watched repeatedly until fully understood. |
C.She can perfectly follow the pace of Khan's teaching. |
D.She cannot concentrate when learning in class. |
From the passage, we know that __________.
A.Khan travels to many schools to promote his lessons |
B.Khan plans to include more subjects in the future |
C.Khan gives live math lessons every day for free |
D.Khan set up the Khan Academy with his wife |
Air pollution is damaging 60% of Europe's prime wildlife sites in meadows, forests and bushes, according to a new report.
A team of EU scientists said nitrogen emissions(氮排放) from cars, factories and farming were threatening biodiversity. It's the second report this week warning of the ongoing riks and threats linked to nitrogen pollution.[
Nitrogen in the atmosphere is harmless in its inert(惰性的) state, but the report says reactive forms of nitrogen, largely produced by human activity, can be a menace to the natural world.
Emissions mostly come from vehicle exhausts(排气), factories, artificial fertilizers(肥料) and animal waste from intensive farming. The reactive nitrogen they emit to the air disrupts the environment in two ways: It can make acidic soils too acidic to support their previous mix of species. But primarily, because nitrogen is a fertilizer, it favors wild plants that can maximize the use of nitrogen to help them grow.
In effect, some of the nitrogen spread to fertilize crops is carried in the atmosphere to fertilize weeds, possibly a great distance from where the chemicals were first applied.
The effects of fertilization and acidification favor common aggressive species like grasses, brambles and nettles. They harm more delicate species like mosses(苔藓), and insecteating sundew plants.
The report said 60% of wildlife sites were now receiving a critical load of reactive nitrogen. The report's lead author, Dr. Kevin Hicks from the University of York's Stockholm Environment Institute(SEI), told BBC News that England's Peak District had a definitely low range of species as a result of the reactive nitrogen that fell on the area.
“Nitrogen creates a rather big problem that seems to me to have been given too little attention,” he said. “Governments are responsible for protecting areas like this, but they are clearly failing.”
He said more research was needed to understand the knockon effects for creatures from the changes in vegetation accidentally caused by emissions from cars, industry and farms.
At the conference, the representatives agreed “The Edinburgh Declaration on Reactive Nitrogen”. The document highlights the importance of reducing reactive nitrogen emissions to the environment, adding that the benefits of reducing nitrogen outweigh the costs of taking action.
The underlined word “menace” is used to express that the reactive nitrogen, largely produced by human activity can be ________.
A.frightening | B.threatening | C.unique | D.unusual |
We can infer from the passage that ________.
A.it's harmless to have reactive nitrogen existing in the atmosphere |
B.reactive nitrogen![]() ![]() |
C.the harm to those delicate species has a negative impact on biodiversity |
D.reactive nitrogen can fertilize soils and keep their biodiversity |
The team of EU scientists released the second report of nitrogen emissions this week when ________.
A.no action was taken to stop nitrogen emission |
B.governments were willing to protect areas harmed by nitrogen |
C.“The Edinburgh Declaration on Reactive Nitrogen” was agreed |
D.nitrogen emissions were threatening wildlife sites' biodiversity |
Which of the following would be the best title for the passage?
A.Keeping Away From Nitrogen Emissions |
B.Stopping Nitrogen Emissions |
C.Air Pollution Damaging Europe's Wildlife |
D.Saving Europe's Wildlife |
I think it was my mother who taught me the meaning of honesty. Not because she actually was honest, but because she lied all the time. She felt that the easiest way out of any given situation was generally the best way out. And, for her, that generally meant telling a “little white lie”. As a young child I thought it was kind of cool. And, naturally, when I would come to her with a concern or question wondering what I should do, she generally advised me to lie.
“Mom, I told Theresa that I would go over to her house, but now I would rather go to Sue's house to play.”
“Tell Theresa you're sick,” she would advise. And generally I did. But I didn't seem blessed with her lack of conscience. On many painful occasions Theresa would find out that I really went to Sue's house without her. These occasions taught me that it is more painful to be caught in a lie than it is to tell the truth in the first place. I wondered how it was possible that my mother had never learned that lesson.
I started thinking of all the lies that I'd heard her tell. I remembered the time she told someone that her favorite restaurant had closed, because she didn't want to see them there anymore. Or the time she told Dad that she loved the lawnmower he gave her for her birthday. Or when she claimed that our phone lines had been down when she was trying to explain why she hadn't been in touch with a friend of hers for weeks. And what bothered me even more were all the times she had involved me into her lies. Like the time she told my guidance counselor that I had to miss school for exploratory surgery, when she really needed me to babysit. And it even started to bother me when someone would call for her and she would ask me to tell them that she wasn't there.
So, I started my own personai fight against her dishonesty. When I answered the phone and it was someone my mother didn't want to talk to, I said, “Louise, mom is here, but she doesn't want to talk to you.” The first time I did it, she punished me, but I refused to apologize. I told her that I had decided that it was wrong to lie. And the next time it happened I did the same thing. Finally, she approached me and said, “I agree that lying is not the best thing to do, but we need to find a way to be honest without being rude.” She admitted that her methods weren't right, and I admitted that mine were a bit too extreme.
Over the past few years, the two of us have worked together to be honest—and yet kind. Honesty should mean more than not lying. It should mean speaking the truth in kindness. Though I started by trying to teach my mom the importance of honesty, I ended up gaining a deeper understanding of the meaning of the term.The author's mother ________.
A.thought white lies were not lies |
B.helped the author get out of trouble with white lies |
C.told the author to lie when in trouble |
D.taught the author the importance of being honest |
The author ________.
A.was thankful to her mother's advice |
B.felt more awkward when being caught lying |
C.found that telling the truth hurt more than telling a lie |
D.felt guilty when hurting people with her honesty |
It can be inferred that the author's mother ________.
A.met her friends in the same restaurant regularly |
B.didn't get along with the author's teachers |
C.was not popular among her friends |
D.wanted to have something else for her birthday |
Finally the author and her mother agreed that ________.
A.kindheartedness is more important than honesty |
B.appropriate methods are the key to telling a good lie |
C.honesty is defined as kindness as well as truthfulness |
D.absolute honesty is basic to good interpersonal relationships |
51 .She described all the things she had to do -one was to make her bed-from the moment she woke up until she flew out of the door for work.I suggested she experiment by not making her bed for two weeks.She was shocked, probably thinking I’d been raised by wolves in a forest. 52 .
Two weeks later she went into my office beaming.She had left her bed unmade for the first time in 42 years-and nothing bad had happened.“And you know what?” she said.“I don’t dry my dishes anymore, either.”
53 .One was discovering that she had choices in her life that she had never seen before.The other was giving herself permission to be less that perfect.This story shows an important principle (原理) about managing time: No one can do it all.Each of us has to make choices and accept trade – offs.The problem is, many people choose in ways that put themselves and their health last.They take better care of their houses and cars than they do of themselves. 54 .
So what is the solution? There’s an easy way.Decide what you want in your life, and put that first.On a daily basis, that should include regular meals, enough sleep and time with your family.Exercise, leisure, friendships and hobbies should also be regular aspects of life. 55 .The choice is yours: whatever makes you feel good about yourself and your life.Take a nap(小憩).Take a walk.Take time to play the piano.Stop bringing your briefcase home from the office.Stop keeping your house as clean as your mother kept hers.Fill more of your time with want – to – dos instead of have – to – dos.
A.This woman had made two major breakthroughs (突破). |
B.Above all, you needn’t do anything for yourself regularly. |
C.They put everyone else’s needs ahead of their own. |
D.However, she went along with my idea. |
E.Most people do not take time to relax themselves.
F.The point is to do something for yourself every day.
G.A patient came to see me about the stress in her life.
The pupils of the remote Beau-Roc primary school in Haiti are chanting (singing the same words again and again).One of them plays a guitar made from an empty oil tin.Their headmistress, Emile Jean-Noel, is one of the few women school headteachers in the country.
Today, over 70% of Haitian population live without proper food, water, schools, or housing. To reduce the hunger that prevents learning and to encourage parents to send their children to school, meals are provided by the World Food Programme.
"We are so cut off that we have many difficulties," comments Emile, adding that finding chalk, school books and other materials is practically impossible.Emile tries to encourage people around her to make use of available resources.Her efforts are bearing fruit.One of her successes was convincing local women to contribute to their children' s schooling and increase their income by selling embroidery(刺绣) and other handicrafts.
Recent political instability(不稳定)has meant that the country has not invested (投资) in education for ten years.Only 44% of children go to school and less than half of them finish primary school. Less than a third of these children go on to secondary school.In rural areas it is not rare to find 17 and 18 year olds in primary school- Beau-Roc has only 4 teachers for 260 pupils.Emile works constantly to improve her pupils' environment.Under her direction, a local worker is now constructing a store house for the food delivered regularly by the WFP.
Not only is Emile' s salary small, but she receives it irregularly.For her, transport is a real headache.She lives five kilometers away and has to take the tap tap, a privately-owned bus, costing more than she can afford.
"The decision to be a rural teacher in Haiti should not be taken lightly" , Emile comments. "With all the sacrifices and risks it requires, only those who are really cut out for teaching should do it." However, Emile loves her job."I always feel at home with the children and, because the parents understand what I'm doing, I try to give my best."Which of the following is extremely difficult for Beau-Roc primary school?
A.Teaching the women how to make embroidery and other handicrafts. |
B.Persuading local women to care about their children' s education. |
C.Encouraging people around to use those available resources. |
D.Finding chalk, school books and other materials. |
In the last paragraph, "those who are really cut out for teaching" refer to people who are _____.
A.dismissed from teaching | B.unfamiliar with teaching |
C.qualified for teaching | D.cautious about teaching |
What topic is presented in this passage?
A.Hardship for teachers. | B.Devotion to education. |
C.Politics and children. | D.Love and beauty. |
In many cultures white is often associated with something positive.A white-collar job, for instance, is the kind of job many people look for, working with your brain and not your hands.
White has a clean and pure image.That is why doctors, dentists, and nurses usually wear white uniforms.Babies are dressed in white at baptisms(洗礼)and brides wear white wedding gowns at weddings.White in these cases is the symbol of innocence or purity.
Sometimes white is used in expressions that are not good.“Whitewash” is one such expression.At first, “whitewash” meant to paint over something with white paint to make it look better.However, it means something different today: to hide or to cover up mistakes or failures.
A “white elephant” is another example of white used in a negative way.In ancient Thailand, a white elephant was regarded as a sacred animal, but it was very expensive to keep.The kings of those days presented a white elephant to the people they wanted to ruin.Once they received this holy, royal animal as a gift, they were not allowed to sell or kill it.Today, a “white elephant” means something that is big, useless, and unwanted.In America, when people want to get rid of their furniture or clothes, they often have a “white elephant sale”.The text is mainly about________.
A.the meanings of white in English culture | B.the history of some English idioms |
C.some interesting customs in English culture | D.some useful English words and expressions |
Which expression has an historical background ?
A.White-wash. | B.White-collar. |
C.White elephant. | D.White elephant sale. |
In which statement does “white” have a negative meaning?
A.A boy is dressed in white at baptisms. | B.A bride wears a white wedding gown. |
C.A man whitewashes his crime. | D.A girl finds a white collar job. |
The author develops the text mainly by ______.
A.analyzing its cause and effect | B.providing typical examples |
C.comparing different ideas | D.following the time order |