PEOPLE who have had a painful experience may wish they could wipe the memory from their minds. Researchers at Johns Hopkins University, US, say that this may someday be possible.
A drug remains far off, but researchers have laid a foundation with their discovery that proteins can be removed from the brain’s fear center to cut memories forever.
Previous research had already shown that a special behavior therapy (治疗) could cut painful memories. But relapse (复发) was possible because the memory hadn’t necessarily disappeared.
By looking at that process, Richard Huganir and Roger Clem, two researchers from Johns Hopkins University, discovered a “window of vulnerability (脆弱的窗口)” when proteins are created. The proteins help signals travel within the brain as painful memories are made. Because the proteins are unstable, they can be easily removed with drugs or behavior therapy to cut memories.
Researchers used mice to find the window, but think the process would be the same in humans. They used electric shocks to make the mice fear a certain sound. The sound triggered (触发) the creation of the proteins, called calcium-permeable (钙通透性) AMPARS, which formed for a day or two in the fear centers of the mice’s brains.
The researchers are working on ways to reopen the window by recalling (唤醒) the painful memory and using drugs to remove the protein. They published their report online last month in Science Express.
Their research has drawn interest and concern from experts in mental healthcare.
Kate Farinholt, a mental health expert with the National Alliance on Mental Illness, Maryland, US, said many people suffering from a painful event might benefit from erasing a memory. “Erasing a memory and then everything bad built on that is an amazing idea, and I can see all sorts of potential ,” she said.
But there are a lot of unanswered questions, too.
“Completely deleting a memory is a little scary. How do you remove a memory without removing a part of someone’s life,” Farinholt said. “And is it best to do that, considering that people grow and learn from their experiences?”What have researchers at Johns Hopkins University found recently?
| A．A new drug to erase painful memories from human brains. |
| B．A special behavior therapy to erase painful memories. |
| C．Removing certain proteins from the brain can wipe painful memories. |
| D．Erasing memory damages a patient’s brain functions. |
What makes it possible to erase painful memories according to Paragraph 4?
| A．The way the brain cells are created. |
| B．The unstable character of the proteins in the brain. |
| C．The strength of the signals the proteins send. |
| D．The drugs that can stop the formation of memories. |
Which of the following shows the stages of the process done on mice?
a. removal of fear proteins b. making mice fear a certain sound
c. fear proteins created in mice brains d. making mice recall painful memories
| A．a-b-c-d | B．d-a-c-b | C．b-c-d-a | D．c-b-d-a |
What is Kate Farinholt’s opinion of the research?
| A．People may lose the chance to learn from their bad experiences. |
| B．The research will be a great breakthrough in treating painful memories. |
| C．People could suffer long-term memory loss. |
| D．People could forget happy memories as well. |
If you want to get the most out of the study of a language, you must also read for pleasure: novels, plays, travel books, and so on. And in reading books of this kind the important thing is to get on with the reading; to try to grasp what the writer is going to tell you in the book as a whole. This is impossible if you stop and think over the meaning of every single word which happens to be unfamiliar(不熟悉). You can not enjoy a story if you stop half a dozen times on every page in order to look up words in the dictionary. You may even prevent yourself from understanding the story as a whole by doing this.
When you are reading books of this kind, therefore, you will usually have to rely mainly on(依靠) the context (上下文) to help you. If you meet an unfamiliar word, do not let it take too much of your attention from the main thread(主线) of the story. In all probability(可能) you will meet the same word again a few pages later on in a slightly different context, and each time you see it that your understanding of it will become more exact.To read for pleasure means _____________.
| A．to take pleasure in reading |
| B．to be satisfied in reading book |
| C．to read such books as novels, plays, travel books, etc |
| D．to go on with reading pleasantly |
The phrase “to ge
t on with reading” in the passage has the same meaning as “_________”.
| A．to try to grasp the meaning of every sentence in the book |
B．to try to catch the meaning of every word i n the book |
| C．to try to understand all the writer is going to tell you |
| D．to try to understand the main idea of the book |
、When you meet new words in reading such kinds of books, you’d better _________.
| A．stop and look them up in a dictionary | B．stop and think them over |
| C．try to guess their meanings from the context | D．have none of them |
According to the passage the best way to read novels, plays and travel books is _____.
| A．to read very slowly | B．to read quickly and not too carefully |
| C．to read very carefully | D．to read very seriously |
The best title for this passage is “___________”.
| A．Read for Pleasure | B．Get on with the Books |
| C．Reading Skills | D．The Importance of Reading |
As people slowly learn to cure diseases, control floods, prevent hunger, and stop wars, fewer people die every year. As a result, the population of the world is becoming larger. In 1925 there were about 2 billion people in the world; today there are over 6 billion.
When the number rises, extra mouths must be fed. New lands must be brought under development, or land already farmed must be made to produce more crops. In some areas the land is so over-developed that it will be difficult to make it provide more crops. In some areas the population is so large that the land is divided into too tiny units to make improvement possible with farming methods. If a large part of this fa
rming population went into industrial work, the land might be farmed much more productively (多产地) with modern methods.
There is now a race for science, technology, and industry to keep the output of food rising faster than the number of people to be fed. New types of crops, which will grow well in bad weather, are being developed, so there are now farms beyond the Arctic Circle in Siberia and North America. Irrigation (灌溉) and dry-farming methods bring poor lands under the plough. Dams hold back the waters of great rivers, which can provide water for the fields in all seasons and provide electric power for new industries. Industrial chemistry provides fertilizer to suit different soils. Every year, some new methods are made to increase or to protect the food of the world. The author says that the world population is increasing because _____.
| A．there are many rich valleys and large fields |
| B．farmers are producing more crops than before |
| C．people are living longer due to better living conditions |
| D．new lands are being made into farmlands |
The author says that in areas with large populations, land might be more productively farmed if _____.
| A．the land was divided into smaller pieces |
| B．people moved into the countryside |
| C．industrial methods were used in farming |
| D．the units of land were much larger |
We are told that there are now f
arms beyond the Arctic Circle. This has been made possible by _____.
| A．growing new types of crops |
| B．irrigation and dry-farming means |
| C．providing fertilizers |
| D．destroying pests and diseases |
Why is the land divided into tiny units in some areas?
| A．There are too many people living there. |
| B．It saves more natural resources there. |
| C．It prevents crops from serious diseases there. |
| D．Farmers can grow various kinds of crops there. |
Why do some people use dams to hold back waters from great rivers?
| A．To develop a new kind of dry-farming methods. |
| B．To prevent crops from floods. |
| C．To provide water and electricity in all seasons. |
| D．To water poor lands in bad weather. |
Most shops in Britain open at 9:00 am, and close at 5:00 or 5:30 in the evening. Small shops usually close for an hour at lunchtime. On one or two days a week—usually Thursday and/or Friday—some large food shops stay open until about 8:00 pm for late night shopping.
Many shops are closed in the afternoon on one day a week. The day is usually Wednesday or Thursday and it is a different day in different towns.
Nearly all shops are closed on Sundays. Newspaper shops are open in the morning, and sell sweets and cigarettes as well. But not all the things can be sold on Sundays.
Usually it is not difficult for foreign visitors to find where to buy things. Most shops sell the things that you want to buy. One problem is stamps. In Britain you can only buy these at post offices. Many large food shops are self-service. When you go into one of these shops, you take a basket and you put the things you wish to buy into this. You pay for everything just before you leave. If anyone tries to take things from a shop without paying they are almost certain to be caught, because most shops have detectives.
When you are waiting to be served in a shop, it is important not try to be served before people who arrive before you. Many foreign people are surprised at the British way of queuing (排队).Most shops in Britain stay open for about ______ a day.
| A．eight hours | B．five hours | C．ten hours | D．six hours |
According to the passage, which of the following statements is NOT true?
| A．Some large food shops open for about 11 hours on Thursday or Friday. |
| B．Many shops are closed in the afternoon once a week on Tuesday. |
| C．Only a few things can be bought on Sundays. |
| D．It is not difficult for foreign visitors to buy things in Britain. |
You can not buy ______ in shops.
| A．cigarette. | B．sweets. | C．stamps. | D．clothes. |
Which of the following statements is TRUE?
| A．Most shops usually close for an hour at lunchtime. |
| B．Many large shops are self-service. |
| C．Most shops have detectives. |
| D．People do not have to queue to be served. |
Which of the following statements can be the best title of this passage?
| A．Shops in Britain |
| B．How to buy things in Britain? |
| C．The British Way of Queuing |
| D．How long are the British shops? |
A well-dressed man entered a famous jewelry shop. He explained that he wished to buy a pearl for his wife’s birthday. The price didn’t matter. Since business had been very good for him that year. After examining a nice black one that cost $5000, he paid for the pearl in cash, shook hands with the jeweler, and left.
A few days later the man returned and said that his wife liked the pearl so much that she wanted another one just like it. It had to be exactly the same size and quality, as she wanted a pair of earrings made, “Can you give me any advice on how to get such a pearl?” said the man. The jeweler regretfully replied, “I would say it’s exactly impossible to find one exactly like that pearl.”
The rich man insisted that the jeweler advertise in the newspapers, offering $ 25,000 for the matching pearl. Many people answered the advertisement but nobody had a pearl that was just right.
Just when the jeweler had given up hope, a little old lady came into his store. To his great surprise, she pulled the perfect pearl from her purse. “I don’t like to part with it,” she said sadly, “I inherited it from my mother, and my mother inherited it from hers. But I really need the money.”
The jeweler was quick to pay her before she changed her mind. Then he called the rich man’s hotel to tell him the good news. The man, however, was nowhere to be found.The man said he wanted to buy a pearl for ______.
| A．his wife | B．his mother -in–law |
| C．his own mother | D．no one |
He paid $ 5,000 for the black pearl without bargaining because ______.
| A．he was very rich | B．he wanted to make the jeweler believe him |
| C．he was anxious to get it | D．his business had been successful |
He told the jeweler to get him another pearl that must be ______.
| A．exactly the same size as the black one |
| B．exactly the same quality as the black one |
| C．worth no more than $ 25,000 |
| D．exactly as big and nice as the black one |
Many people answered the advertisement because they wanted _______.
| A．to see the perfect pearl |
| B．to buy some beautiful pearls too |
| C．to get in touch with the rich man |
| D．to sell their own pearl at a high price |
The jeweler couldn’t find the man anywhere because ______.
| A．he died suddenly. |
| B．He happened to be out |
| C．He got $ 20,000 by cheating and had run away with the money. |
| D．He wouldn’t show up until the jeweler called him a second time. |
The famous director of a big and expensive movie planned to film a beautiful sunset over the ocean, so that the audience could see his hero and heroine in front of it at the end of the film as they said goodbye to each other for ever. He sent camera team out one evening to film the sunset for him.
The next morning he said to the men, “Have you provided me with that sunset?”
“No, Sir,” the men answered.
The director was angry. “Why no
t?” he asked.
“Well,” one of the men answered, “we are on the east coast here, and the sun sets in the west. We can get you a sunrise over the sea, if necessary, but not a sunset.”
“But I want a sunset!” the director shouted. “Go to the airport, take the next flight to the west coast, and get one.”
But then a young secretary had an idea. “Why don’t you photograph a sunrise,” she suggested, “and then play it backwards, Then it’ll look like a sunset.” “That’s a very good idea!” the director said. Then he turned to the camera team and said, “Tomorrow morning I want you to get me a beautiful sunrise over the sea.”
The cam
era team went out early the next morning and filmed a bright sunrise over the beach in the middle of a beautiful bay. Then at nine o’clock they took it to the director. “Here it is, Sir,” they said, and give it to him. He was very pleased.
They all went into the studio. “All right,” the director explained, “now our hero and heroine are going to say goodbye. Run the film backwards so that we can see the sunset behind them.”
The “sunset” began, but after a quarter of a minute, the 
director suddenly put his face in his hands and shouted to the camera team to stop. The birds in the film were flying backwards away from the beach.One evening, the director sent his camera team out ______.
| A．to watch a beautiful sunset. |
| B．to find an actor and an actress. |
| C．to film a scene on the sea. |
| D．to meet the audience. |
Why did the director want to send his team to the west coast?
| A．Because he changed his mind about getting a sunset |
| B．Because he was angry about his team |
| C．Because it was his secretary’s suggestion |
| D．Because he wanted to get a scene of sunset |
Which of the following is NOT true?
| A．The team followed the secretary’s advice. |
| B．If you want to see a sunrise, the east coast is a place to go to. |
| C．The camera team wasn’t able to film the scene the first day. |
| D．The director ordered his team to stop filming the “sunset” |
The director wanted to film a sunset over the ocean because _____.
| A．it went well with the separation of the hero and heroine |
| B．when they arrived at the beach it was already in the evening |
| C．it was more moving than a sunrise |
| D．the ocean looked more than a sunrise |
After the “sunset” began, the director suddenly put his face in his hands _____.
| A．because he was moved to tears |
| B．as he saw everything in the film moving backwards |
| C．as the sunrise did not look as beautiful as he had imagined |
| D．because he was disappointed with the performance of the hero and the heroine |