Learning a second language can improve brain power, scientists believe. US researchers from Northwestern University say bilingualism(双语) is a form of brain training — a mental "work out" that adjusts the mind finely.
Speaking two languages well affects the brain and changes how the nervous system reacts to sound, lab tests showed. Experts say the experiment performed by the National Academy of Sciences provides "biological" evidence of this.
In an attempt to prove the guess that speaking two languages is good for one's mind, the team monitored how the brain of 48 healthy student volunteers reacted to different sounds. Twenty three of these volunteers were bilingual.
The scientists used special equipment to trace the pattern of brainwaves. Under quiet, laboratory conditions, the bilingual students responded in a similar way to the English-only-speaking students, who formed the control group. But the bilingual group were far superior at processing sounds even when there were a lot of people talking in the room. They were better able to focus on to the important information — the speaker's voice — and block out other distracting noises.
Prof Nina Kraus, who led the research, said: "The bilingual's better experience with sound results in a hearing system that is highly efficient, flexible and focused in its automatic sound processing, especially in challenging or novel listening conditions."
Co-author Viorica Marian said: "People do crossword puzzles and other activities to keep their minds sharp. But the advantages we've discovered in double language speakers come automatically simply from knowing and using two languages.''
Musicians appear to gain a similar benefit when rehearsing(彩排), say the researchers. According to some theories, being bilingual might help avoid dementia（痴呆）.What’s the purpose for the lab test led by Prof Nina Kraus?
| A．To find how better the bilingual students can react to sound than other students. |
| B．Just to find scientific proof for a previous guess. |
| C．To show the students how good it is to learn a second language. |
| D．To find a way to prevent dementia. |
What does the underlined word “distracting” mean?
| A．tiring | B．exciting |
| C．interesting | D．disturbing |
What does Viorica Marian seem to believe?
| A．People should do crossword puzzles to keep their minds sharp. |
| B．Bilingual students have more advantages in study than non-bilingual ones. |
| C．Speaking two languages is an easier way for people to increase their brain power. |
| D．Bilingual students are better at solving crossword puzzles. |
What conclusion could be drawn from the passage?
| A．Being bilingual strengthens brain power. |
| B．Speaking a second language can change your nervous system. |
| C．Bilingual musicians perform better on stage. |
| D．The English-only-speaking students can concentrate easily. |
How was the bilingual group better at processing sounds?
| A．They were the control group. |
| B．They could better fix their attention on something of importance. |
| C．They were able to find the speaker’s voice quickly. |
| D．They had better nervous system. |
I had the meanest mother in the world．While other kids ate candy for breakfast．I had to have cereal, eggs and toast．Others had cakes and candy for lunch, while we had to eat a sandwich．As you can guess, my supper was different from t
he other kids'．But at least I was not alone in my suffering．My sister and two brothers had the same mean mother as I did．
My mother insisted on knowing where we were at all times．She had to know who our friends were and what we were doing．We had to wear clean clothes every day．Other kids always wore their clothes for days． We reached the height of disgrace （耻辱） because she made our clothes herself, just to save money．
The worst is yet to come．We had to be in bed by 9:00 each night and up at 7:45 the next morning．So whil
e my friends slept, my mother actually had the courage to break Child Labor Law．She made us work I
believed she lay awake all night thinking up mean things to do to us．Through the years, our friends' report cards had beautiful colors on them, black for passing, red for failing．My mother, however, would only be satisfied with black marks．None of us was allowed the pleasure of being a dropout （辍学者）．
She forced us to grow up into educated and honest adults．Using this as a background, I'm now trying to bring up my three children．I'm filled with pride when my children think I am mean because now I thank God every day for giving me the meanest mother in the world．From the passage we can learn that the writer's mother was____．
| A．not generous at all | B．very cruel to her children |
| C．very mean with money matters | D．very strict with her children |
Which of the following things did the writer hate to do most?
| A．Eating differently from other kids． | B．Letting mother know where they were． |
| C．Going to bed early and getting up early． | D．Wearing clean clothes made by mother． |
It can be inferred from the passage that____．
| A．the writer's family lived a miserable life |
| B．all the other kids studied better than the writer |
| C．Mother was punished for breaking the Labor Law |
| D．the writer worked hard and usually got good grades in studies |
Which of the following statements is NOT true according to the passage?
| A．The writer is very thankful to her mother． |
| B．The writer has a deep hatred for her mother． |
| C．Mother practiced economy in running her home． |
| D．The writer is strict with her children when bringing them up． |
The passage was written in a way of____tone．
| A．humorous | B．hateful | C．ridiculous | D．impatient |
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。
Most people buy a lot of gifts just before Christmas. But some people think we buy too much. They have started a special day called Buy Nothing Day. .
Buy Nothing Day is November 29. It’s 25 days before Christmas. It’s after Thanksgiving and often the first day of Christmas shopping..
The idea for Buy Nothing Day started in Vancouver, British Columbia.. In Califor
nia, parents and children get together to read stories, sing songs, and paint pictures. The children talk about why they don’t need a lot of toys. This year, in Manchester, England, people dressed up in costumes to tell people that we buy too much.
In Albuquerque, New Mexico, high school students.wanted to tell other students about Buy Nothing Day. They organized a spaghetti dinner to give people information about Buy Nothing Day. . They made posters and talked to other students about it.
. The students at high
schools liked the idea of this new tradition. Next year, they want to have another dinner to tell more people about Buy Nothing Day.
| A．They asked restaurants in the neighborhood to donate the food. |
| B．At this time, we see ads in Newspapers and, on TV telling us to “ buy, buy, buy!” |
| C．Buy Nothing Day has successfully persuaded people not buy anything. |
| D．Many people think highly of the idea of Buy Nothing Day. |
E. They don’t want anyone to go shopping on that day.
F. Now people all over the world celebrate Buy Nothing Day.
G. The dinner was a big success, and many students agreed not to buy anything on November 29.
In summer, millions of people will head for the beach．And while the ocean can be a great place to swim and play, it may also be useful in another way．Some scientists think that waves could help make electricity．
“Have you ever been on a surfboard or boat and felt yourself being lifted up by a wave? Or have you jumped in the water and felt the energy as waves crashed over you?” asked Jamie Taylor of the Wave Energy Group at the University of Edinburgh in Scotland．“There is certainly a lot of energy in waves．”
Scientists are working on using that energy to make electricity．
Most waves are created when winds blow across the ocean．“The winds start out by making little ripples （波纹） in the water, but if they keep on blowing , those ripples get bigger and bigger and turn into waves, ”Taylor said．“Waves are one of nature’s ways of picking up energy and then
sending it off on a journey．”
When waves come towards the shore, people can set up dams or other barricades to block the water and send it through a l
arge wheel called a turbine （涡轮） ．The turbine can then power an electrical generator （发电机） ．
The United States and a few other countries have started doing research on wave energy , and it is already being used in Scotland．
The resource is huge．We will never run out of wav
e power, besides, wave energy does not create 
the same pollution as other energy sources, such as oil and coal．
Oceans cover three quarters of the earth’s surface．That would make wave power seem perfect for creating energy around the world．There are some drawbacks, however．
Jamie Taylor said that wave power still cost too much money．He said that its effects on animals in the sea were still unknown．Plus, wave power would get in the way of fishing and boat traffic．
With more research, however, “many of these problems might be overcome,” Taylor said．“Demand for energy to power our TVs and computers, drive our cars, and heat and cool our homes is growing quickly throughout the world．Finding more energy sources is very important, for traditional sources of energy like oil and gas may run out some day．”
In the future, when you turn on a light switch, an ocean wave could be providing the electricity!Which of the following is NOT true?
| A．Wave power doesn’t cost too much money． |
| B．Wave energy is so clean that it doesn’t create the same amount of pollution as other energy sources． |
| C．Wave power affects fishing and boat traffic． |
| D．Wave power may affect marine animals． |
We can infer from the passage that ______．
| A．finding more new energy sources is not necessary because of wave energy |
| B．wave energy is a resource that will never run out and is used all over the world |
| C．wave power is not quite perfect for creating energy around the world |
| D．wave power doesn’t create any pollution |
The underlined word “drawbacks” probably means ______．
| A．regrets | B．adventures | C．disadvantages | D．difficulties |
What can be the best title for the passage?
| A．How to Get Electricity by Waves | B．The advantages of Wave Energy |
| C．Can Waves Make Electricity? | D．The Disadvantages of Wave Energy |
The Diet Zone: A Dangerous Place
Diet Coke, diet Pepsi, diet pills, no-fat diet, vegetable diet… We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically(心理上) and physically（身体上）.
Diet products significantly weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie 
not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the scale（秤）instead. All we have to do is to swallow or recognize the word “diet” in food labels.
On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink, we are telling ourselves without our awareness that we don’t have to work to get results. Diet products make people believe that gain comes without pai
n, and that life can be without resistance and struggle.
The danger of diet products lies not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients(营养成分). Diet foods and diet pills contain zero calorie only be
cause the diet industry has created chemicals to produce these wonder products. Diet products may not be nutritional, and the chemical that go into diet products are potentially dangerous.
Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemica
ls. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological harm that comes from using them.One psychological effect of diet products is that people tend to _____.
| A．try out a variety of diet foods | B．hesitate before they enjoy diet foods |
| C．pay attention to their own eating habits | D．watch their weight rather than their diet |
In Paragraph 3, “gain comes without pain” probably means ______.
| A．losing weight is effortless | B．it costs a lot to lose weight |
| C．diet products bring no pain | D．diet products are free from calories |
Diet products indirectly harm people physically because such products ______.
| A．are over-consumed | B．lack basic nutrients |
| C．are short of chemicals | D．provide too much energy |
A good heart
Dikembe Mutombo grew up in Africa among great poverty and disease. He came to Georgetown University on a scholarship(奖学金) to study medicine — but Coach(教练) John Thompson got a look at Dikembe and had a different idea. Dikembe became a star in the NBA, and a citizen of the United States. But he never forgot the land of his birth, or the duty to share his fortune with others. He built a new hospital in his old hometown in the Congo. A friend has said of this good-hearted man: “Mutombo believes that God has given him this chance to do great things.”
Success and kindness
After her daughter was born, Julie Aigner-Clark searched for ways to share her love of music and art with her child. So she borrowed some equipment, and began filming children’s videos(录像) in her own house. The Baby Einstein Company was born, and in just five years her business grew to more than $20 million in sales. And she is using her success to help others — producing child safety videos with John Walsh of the National Center for Missing and Exploited Children. Julie says of her new program: “I believe it’s the most important thing that I have ever done. I believe that children have the right to live in a world that is safe.”
Bravery and courage
A few weeks ago, Wesley Autrey was waiting at a Harlem subway station with his two little girls when he saw a man fall into the path of a train. With seconds to act, Wesley jumped onto the tracks, pulled the man into the space between the rails(铁轨), and held him as the train passed right above their heads. He insists he’s not a hero. He says: “We have got to show each other some love.” Mutombo believes that building the new hospital is ______.
| A．helpful to his personal development | B．something he should do for his homeland |
| C．a chance for his friends to share his money | D．a way of showing his respect to the NBA |
What did the Baby Einstein Company do at its beginning?
| A．Produce safety equipment for children. | B．Make videos to help protect children. |
| C．Sell children’s music and artwork. | D．Look for missing and exploited children. |
Why was Wesley Autrey praised as a hero?
| A．He helped a man get across the rails. | B．He stopped a man from destroying the rails. |
| C．He protected two little girls from getting hurt. | D．He saved a person without considering his own safety. |
The title of the passage is most like
ly to be_______________.
| A．Three Stories | B．Heroes of Our Time |
| C．Be Ready to Help Others | D．To Be a Kind Person |