Four people in England back in 1953, stared at Photo 51. It wasn’t much—a picture showing a black X. But three of these people won the Nobel Prize for figuring out what the photo really showed –the shape of DNA. The discovery brought fame and fortune to scientists James Watson, Francis Crick, and Maurice Wilkins. The fourth, the one who actually made the picture, was left out
Her name was Rosalind Franklin. “She should have been up there,” says historian Mary Bowden. “If her photos hadn’t been there, the others couldn’t have come up with the structure.” One reason Franklin was missing was that she had died of cancer four years before the Nobel decision. But now scholars doubt that Franklin was not only robbed of her life by disease but robbed of credit by her competitors
At Cambridge University in the 1950s, Watson and Click tried to make models by cutting up shapes of DNA’s parts and then putting them together. In the meantime, at King’s College in London, Franklin and Wilkins shone X-rays at the molecule(分子). The rays produced patterns reflection the shape.
But Wilkins and Franklin’s relationship was a lot rockier than the celebrated teamwork of Watson and Crick. Wilkins thought Franklin was hired to be his assistant .But the college actually employed her to take over the DNA project.
What she did was produce X-ray pictures that told Watson and Crick that one of their early models was inside out. And she was not shy about saying so. That angered Watson, who attacked her in return, “Mere inspection suggested that she would not easily bend. Clearly she had to to go or be put in her place.”
As Franklin’s competitors, Wilkins, Watson and Crick had much to gain by cutting her out of the little group of researchers, says historian Pnina Abir-Am. In 1962 at the Nobel Prize awarding ceremony, Wilkins thanked 13 colleagues by name before he mentioned Franklin, Watson wrote his book laughing at her. Crick wrote in 1974 that “Franklin was only two steps away from the solution.”
No, Franklin was the solution. “She contributed more than any other player to solving the structure of DNA . She must be considered a co-discoverer,” Abir-Am says. This was backed up by Aaron Klug, who worked with Franklin and later won a Nobel Prize himself. Once described as the “Dark Lady of DNA”, Franklin is finally coming into the light.
72. What is the text mainly about?
A. The disagreements among DNA researchers.
B. The process of discovering DNA.
C. The race between two teams of scientists.
D. The unfair treatment of Franklin.
73. Which of the following is NOT true according to the passage?
A. Franklin didn’t feel shy about pointing out the mistake of Watson and Crick.
B. Wilkins and Franklin didn’t get along very well.
C. Franklin didn’t win the Nobel Prize because she was two steps away from the solution.
D. Without Franklin’s X-ray pictures, the other competitors couldn’t have won the Nobel Prize.
74. Why is Franklin described as “Dark Lady of DNA”?
A. She developed pictures in dark labs.
B. She discovered the black X-the shape of DNA.
C. Her name was forgotten after her death.
D. Her contribution was unknown to the public.
75. What is the writer’s attitude toward Wilkins, Watson and Crick?
A. Respectful. B. Disapproving. C. Admiring. D. Doubtful.
The people who built Stonehenge in southern England thousands of years ago had wild parties, eating barbecued pigs and breaking pottery. This is according to recent work by archaeologists—history experts who investigate (调查) how human beings lived in the past.
Archaeologists digging near Stonehenge last year discovered the remains of a large prehistoric village where they think the builders of the mysterious stone circle used to live.
The village is about 4600 years old, the same age as Stonehenge and as old as the pyramids in Egypt. It is less than two miles from the famous ancient landmark and lies inside a massive manmade circular dirt wall, or “henge”， known as the Durrington Walls.
Remains found at the site included jewellery, stone arrowheads, tools made of deer antlers, wooden spears and huge amounts of animal bones and broken pottery. “These finds suggest Stone Age people went to the village at special times of the year to feast and party”， says Mike Parker Pearson from Sheffield University in England.
He said many of the pig bones they found had been thrown away halfeaten. He also said the partygoers appeared to have shot some of the farm pigs with arrows, possibly as a kind of sport before barbecuing them.
An ancient road which led from the village to the River Avon was also found. Here, the experts think, people came after their parties to throw dead relatives in the water so the bodies would be washed downstream to Stonehenge.
Parker Pearson believes Stonehenge was like a cemetery where ancient Britons buried the dead and remembered their ancestors. “The theory is that Stonehenge is a kind of spirit home to the ancestors.”
The recent discovery of the village within the Durrington Walls shows that Stonehenge didn't stand alone but was part of a much bigger religious site, according to Parker Pearson.
People still come to worship and celebrate at Stonehenge today. They meet there when the sun sets on the shortest day of winter and when it rises on the longest day of summer. But the days of barbecuing whole pigs there and throwing family members into the river are a thing of the past.What was Stonehenge according to the text?
| A．A village where hundred of people once lived. |
| B．A place that regularly hosted large parties. |
| C．A church where local villagers would get married. |
| D．A site where dead people were placed or remembered. |
From the text we can infer that the people who came to the village ________.
| A．liked to drink wine | B．knew how to hunt |
| C．were from Egypt | D．lived by the River Avon |
What do experts think people did after the village parties?
| A．Returned to live at Stonehenge. |
| B．Prayed for good luck in the new year. |
| C．Hunted farm pigs as a sport. |
| D．Put their dead relatives in the river. |
When do people most often go to Stonehenge today?
| A．When a new discovery is made. |
| B．At the beginning of summer and winter. |
| C．On the longest and shortest days of the year. |
| D．When they want to have a barbecue. |
It is love that makes the world go round. And it is also love that has such power to overcome all difficulties. So we say: “Love will find a way.” As smile is a facial expression showing pleasure, affection, and friendliness, it is the commonest way to show our good will perfectly without saying anything. A Chinese saying runs: “never hit a person who is smiling at you.” It is a time-proven fact that the smile is a language all its own— a universal language—understood by the people of every nation in the world. We may not speak the same tongue as our foreign neighbors, but we smile in the same tongue. We need no interpreter for thus expressing love, happiness, or good will.
One day while shopping in a small town in southern California, it was my misfortune to be approached by a clerk whose personality contradicted mine. He seemed most unfriendly and not at all concerned about my intended purchase. I bought nothing, and marched angrily out of the store. My anger toward that grew with each step. Outside, standing at the corner, was a dark-complexion young man in his early twenties. His expressive brown eyes met and held mine, and in the next instant a beautiful, dazzling smile covered his face. I gave in immediately. The magnetic power of that shining smile drove away all bitterness within me, and I found the muscles in my own face happily responding. “Beautiful day, isn’t it?” I remarked, in passing. Then, suddenly something inside me sent me turning back. “I really owe you a debt of gratitude,” I said softly. His smile deepened, but he made no attempt to answer. A Mexican woman and two men were standing nearby. The woman stepped forward and eyed me inquiringly. “Carlos, he no speak English,” she volunteered. “You want I should tell him something?” In that moment I felt transformed. Carlos’ smile had made a big person of me. My friendliness and good will toward all mankind stood ten feet tall. “Yes,” my reply was enthusiastic and sincere, “tell him I said ‘Thank you!’” “Thank you?” The woman seemed slightly puzzled. I gave her arm a friendly pat as I turned to leave. “Just tell him that,” I insisted. “He’ll understand. I am sure!” Oh, what a smile can do! Although I have never seen that young man again, I shall never forget the lesson he taught me that morning.
From that day on, I became smile – conscious, and I practice that diligently, anywhere and everywhere, with everybody. When I got excited in traffic, taking the right–of–way (公路用地) from the other car with my stupid mistake, I’d smile and shrug my shoulders apologetically. This action on my part would always draw a good–natured smile in return. If the other fellow was at fault – and if I could remember my resolution in time! – he’d get a broad smile of understanding. This took a bit of doing at first. I’ll admit it wasn’t always easy, but it was fun. The results were sometimes amazing. Many times, a broad, friendly smile would completely turn aside ill–feeling and tension. I’m wondering now how many tragic accidents could be avoided on our overcrowded highways, if every driver remembered to smile!The author got angry while shopping one day because .
| A．of the clerk’s unfriendliness and lack of concern |
| B．of her misfortune |
| C．she failed to purchase what she intended |
| D．a dark–complexion young man laughed at her |
From the conversation between the author and the Mexican woman, we can infer that the woman .
| A．was well–educated but unwilling to help others |
| B．was able to speak English |
| C．knew some English and was ready to help others |
| D．was familiar with the young man |
In the author’s opinion, if all people remembered to smile when driving, .
| A．many traffic accidents could be avoided |
| B．they would receive a good natural smile in return |
| C．they could get a broad smile of understanding |
| D．they wouldn’t feel any tension |
The best title for this passage could be .
| A．The Art of Smiling |
| B．The Universal Language |
| C．The Power of Love |
| D．The Magic Power of Friendship |
To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen (氧气) and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.
Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.
A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.If a fire breaks out on a bus, which of the follow should be ready there for you to use?
A.Sand B.Water C.A blanket. D.An extinguisher.
【 小题2】 To cover a small piece of burning wood with a basin in order to stop the fire is an example of _______.
A.separating the fire B.reducing the heat
C.removing the fuel D.cutting off the oxygenIn choosing how to put out a fire, we should first be clear about_______.
| A．when it breaks out | B．how it comes about |
| C．what kind it is | D．where it takes place |
What would the author probably discuss in the paragraph that follows?
| A．Another class of fires |
| B．Another type of extinguishers |
| C．How fires break out. |
| D．How fires can be prevented. |
A home computer not only helps children master the old ways of learning, but also opens up possibilities that simply aren’t available in traditional education. Some software, for example, allows kids to make decisions and see the results in different situations. The World Wide Web encourages young minds to move easily from link to link, topic to topic. The best software draws children into learning by making them curious—what if I click on this picture, drag this over here, visit that website?
Knowing how to use a computer also encourages a child’s confidence. Kids figure out quickly that computers are powerful, and mastering the machine makes them feel grown-up. In turn, feeling confident on a computer often translates to academic(学术的)confidence. Researchers have found that attitudes toward writing, for example, improve when students write on a computer.
Perhaps most importantly, computers can enrich family life. Forget the idea that computer kids are separated. Children like to use the computer with adults and other kids, asking questions and comparing results. “The Internet is a unique opportunity to bring resources home, ”notes Susan Haugland, PhD, Cape Girardeau, Mo. , author of Computer and Young Children:A World of Discovery.
Although the benefits of computers are real, they have disadvantages, too. Kids can lose their way, wasting hours on mindless software of violent games. Just as parents have always helped children make good choices about everything from friends to food, books to TV, now we must make sure they get the best out of computers.The passage is mainly talking about______.
| A．the disadvantages of children’s using computers |
| B．the advantages of children’ using computers |
| C．the development of computers |
| D．the fact that using computers makes children lose their way |
Which of the following is NOT an advantage of a home computer?
| A．It provides new ways of learning. |
| B．It encourages children’ confidence. |
| C．It can enrich family life. |
| D．Kids can play violent games on it. |
What effects do computers have on family life?
| A．They reduce the connection between family members. |
| B．They destroy the relationship between parents and kids. |
| C．They provide more opportunities of communication. |
| D．They make all the family members study together. |
According to the last paragraph, we can learn that we should______.
| A．let children use computers freely |
| B．forbid children to use computers in their spare time |
| C．permit children to use any software they like |
| D．help children make good use of the computers |
It is the injury from breathing cigarettes that has led to the invention of e-cigarettes. Using these cigarettes requires small power from battery and these cigarettes are also available in various flavors and varied nicotine levels. Owing to the fact that the charge from a short cable is required, carrying the electronic cigarettes can’t be that easy in some case. This means that the smoking habits of individuals are in fact controlled! Also, the human body is protected from harmful smoke that is not given off by the electrical version of these new age cigarettes.
The cigarettes are in a fine pack and they are durable(持久的)! For the first time ever, tobacco smokers do not have to carry matches and lighters which may cause burns to their finger tips and boring holes into their clothes! The result is basic dignity for the smokers because they will not disrespect the non-smokers among them by polluting the air that they breathe. Electronic cigarettes and the packages they come in can also be reused, which means that a lot of money can be saved.
They are environmentally friendly. For starters, this kind of cigarettes cannot be put on unless with a source of an electrical current. This means that rooms and pathways do not, under any circumstances, get filled with smoke just because a smoker passed by! The smoke is done away, meaning the air, even around a smoker, is always fresh! Disposals(处理) for the cigarettes have also been invented so that there are no harmful smoking bits and pieces carelessly thrown away which pollute the environment!
E-cigarettes have made the world a better place at the very least. Those who are addicted to smoking on a regular or even irregular basis can therefore do so responsibly and give better consideration to their health.It’s learned from Paragraph 1 that .
| A．the original smoking habits of smokers are hard to control |
| B．e-cigarettes have different tastes and nicotine levels |
| C．the electronic cigarettes are convenient to carry |
| D．the short cable is used to determine how fully the batteries are charged |
What’s the main idea of Paragraph 3?
| A．Why do e-cigarettes produce no smoke. |
| B．E-cigarettes are environmentally friendly. |
| C．Why are disposals for the cigarettes invented. |
| D．E-cigarettes benefit both smokers and non-smokers. |
According to the author, e-cigarettes .
| A．matter less to heavy smokers |
| B．are right alternatives to smokers |
| C．shouldn’t be overvalued |
| D．should be made cheap |
What’s the purpose of this passage?
| A．To introduce an invention. |
| B．To describe the wide spread of e-cigarettes. |
| C．To explain the injury from breathing cigarettes. |
| D．To show how to smoke e-cigarettes. |