When you think about math, you probably don’t think about breaking the law, solving mysteries or finding criminals. But a mathematician in Maryland does, and he has come up with mathematical tools to help police find criminals.
People who solve crimes look for patterns that might reveal (揭示) the identity of the criminal. It’s long been believed, for example, that criminals will break the law closer to where they live, simply because it’s easier to get around in their own neighborhood. If police see a pattern of robberies in a certain area, they may look for a suspect who lives near the crime scenes. So, the farther away from the area a crime takes place, the less likely it is that the same criminal did it.
But Mike O’Leary, a mathematician at Towson University in Maryland, says that this kind of approach may be too simple. He says that police may get better clues to the location of a criminal’s home base by combining these patterns with a city’s layout (布局) and historical crime records.
The records of past crimes contain geographical information and can reveal easy targets — that is, the kind of stores that might be less difficult to rob. Because these stores are along roads, the locations of past crimes contain information about where major streets and intersections are. O’Leary is writing a new computer program that will quickly provide this kind of information for a given city. His program also includes information about the people who live in the city, and information about how a criminal’s patterns change with age. It’s been shown, for example, that the younger the criminal, the closer to home the crime.
Other computer programmers have worked on similar software, but O’Leary’s uses more math. The mathematician plans to make his computer program available, free of charge, to police departments around the country.
The program is just one way to use math to fight crime. O’Leary says that criminology — the study of crime and criminals — contains a lot of good math problems. “I’m the only one who knows what gold looks like,” he says. “It’s a lot of fun.”
49. To find criminals, police usually _________.
A. check who are on the crime scene
B. seek help from local people
C. depend on new mathematical tools
D. focus on where crimes take place
50. O’Leary is writing a computer program that _________.
A. uses math to increase the speed of calculation
B. tells the identity of a criminal in a certain area
C. provides the crime records of a given city
D. shows changes in criminals’ patterns
51. By “I’m the only one who knows what gold looks like”, O’Leary means that he _________.
A. is better at finding gold than others
B. is the only one who uses math to make money
C. knows best how to use math to help solve crimes
D. has more knowledge of gold than other mathematicians
52. What is the main idea of the text?
A. Math could help police find criminals.
B. Criminals live near where crimes occur.
C. Crime records could be used to fight crime.
D. Computer software works in preventing crimes.
Switzerland is famous for its watches. However, this country didn’t invent the watch. It was the British who did it. Here is a story of how the watch was brought to Switzerland.
Many years ago, an Englishman was traveling to Italy, on his way he stopped in a small town in south Switzerland. This Englishman traveled in a carriage inside which there was a carriage watch. This was the earliest kind of watch. A native shop assistant happened to see the watch. He wondered what it was and asked the Englishman about it, “it is a carriage watch,” said the man. “This machine tells the time but now it isn’t working.”
At once the shop assistant offered to try to repair it. So the traveler handed him the watch. The assistant was a very wise man. So it was not very surprising that he managed to repair it. He even remembered how it was made. As soon as the traveler had gone on his journey, he made a watch exactly the same type.
Thus the watch-making was started in Switzerland. Today Swiss watches are sold in stores all over the world.Switzerland is famous for______.
| A．making watches. | B．selling watches. |
| C．inventing watches. | D．the carriage watch |
The earliest watches were made in_______.
| A．Switzerland | B．England | C．Italy | D．a small town |
The first Swiss watch was made by_______.
| A．an Italian shop assistant. |
| B．an English shop assistant. |
| C．a shop assistant in Switzerland. |
| D．a man who was traveling to Italy. |
The carriage watch was a machine which________.
| A．was put in the carriage | B．wasn’t working |
| C．told people time | D．had to be repaired |
Great British is an island that lies off the northwest coast of Europe. The nearest country is France which is 20 miles away. Great British is separated from France by the English Channel. The island is surrounded by the Atlantic Ocean, to the west, and the North Sea, to the east. It includes the main lands of England, Wales and Scotland. Scotland is in the north while Wales is in the west. Ireland, which is also an island, lies off the west coast of Great Britain. It is made up of Northern Ireland and the Irish Republic. Great Britain together with Northern Ireland forms the United Kingdom (U.K.). So the U.K. is made up of four countries. The largest of these is England which is divided into 43 countries. The capital city is London which is on the river Thames. Great Britain is separated from France by_______.
| A．the North Sea | B．Suez Canal | C．English Channel | D．Thames |
Great Britain lies on the ______of the Atlantic ocean.
| A．west | B．north | C．east | D．south |
The United Kingdom is made up of _______.
| A．England, Wales, Scotland and Ireland |
| B．England, Wales, Scotland and Northern Ireland |
| C．Great Britain and Ireland |
| D．Great Britain and the Irish Republic |
It is true that England is________.
| A．the smallest of the four countries in U.K. |
| B．only larger than Wales |
| C．as large as Ireland |
| D．the largest country in U.K. |
School education is very important and useful. Yet no one can learn everything from school. A teacher, no matter how much he knows, can not teach his students everything they want to know. The teacher’s job is to show his students how to learn. He teaches them how to read and how to think. So much more is to be learned outside school by the students themselves.
It is always more important to know how to study by oneself than to learn some facts or a formula by heart. It is actually quiet easy to learn a certain fact in history or a formula(公式) in mathematics. But it is very difficult to use a formula in working out a maths problem. Great scientist, such as Einstein, Newton and Galileo, didn’t get everything from school. But they were all so successful and invented so many things for men. They worked hard all their lives, wasting not a single moment. They would ask many questions as they read and they did thousands of experiments.According to the passage, a good teacher should be one who is to_________.
| A．help his students to gain a good memory. |
| B．train his students’ ability to learn |
| C．teach his students everything he knows |
| D．have his students studying long hours |
If a student want to learn better, the most important thing for him to do is_______.
| A．to learn all the useful facts and formula by heart |
| B．to do everything as his teacher have said in class |
| C．to absorb (吸收) as much knowledge from his teacher as possible |
| D．to think more while he is studying |
The main reason for the success of the great scientists is that________.
| A．the teachers who had taught them were all experienced. |
| B．they used to work and study without a moment’s rest. |
| C．they had received more schooling than other people |
| D．they know how to study and worked hard |
What’s the good advice the writer gives us?
| A．We can learn better without teachers |
| B．We should do more asking and thinking while studying |
| C．We should pay enough attention to classroom |
| D．Book knowledge is little use |
Our surrounding(周围) is being polluted faster than nature and man’s present efforts can’t prevent it. Time is bringing us more people, and more people will bring us more industry, more cars, larger cities, and the growing use of man-made materials.
What can explain and solve this problem? The fact is that pollution is caused by man—by his desire for a modern way of life. We make “increasing industrialization” our chief aim. So we are always ready to offer everything: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from countryside to cities, eager for the benefit of our modern society. But as our technological achievements have grown in the last twenty years, pollution has become a serious problem.
Isn’t it time we stopped to ask ourselves where we are going—and why? It makes one think of the story about the airline pilot who told his passengers over the loudspeaker, “I’ve some good news and some bad news. The good news is that we’re making rapid progress at 530 miles per hour. The bad news is that we’re lost and don’t know where we’re going.” The sad fact is that this becomes a true story when spoken of our modern society. Man can’t prevent the world from being polluted mainly because .
| A．many man-made materials |
| B．more cars, trucks and buses |
| C．more people and more industry |
| D．more cities |
People crowd into the cities because_________.
| A．they want very much to find well-paid jobs |
| B．they eager for the achievement of our modern society |
| C．they have become tired of their homeland |
| D．they have a strong wish to become industrial workers |
The story about the airline pilot tells us that_________.
| A．man knows where the society is going |
| B．people do not welcome the rapid development of modern society |
| C．man can do little about the problem of pollution |
| D．the writer is worried about the future of our society |
What does the writer really want to say in this passage?
| A．With the development of technology, pollution has become a serious problem. |
| B．Lower the speed of development to stop pollution. |
| C．It’s time we did something to reduce pollution. |
| D．As industry is growing fast, pollution is the natural result. |
When you want to go shopping, you’d better decide how much money you can spend on new clothes.
Think about the kind of clothes you really need. Then look for those clothes you really need. Then look for those clothes on sale.
There are labels(标签) inside all new clothes. The labels tell you how to take care of your clothes. The label for a shirt may tell you to wash it in warm water. A sweater label may tell you to wash in cold water. The label on a coat may say “dry clean only”, for washing may ruin this coat. If you do as the directions(说明) on the label, you can keep your clothes looking their best for a long time.
Many clothes today must be dry cleaned. Dry cleaning is expensive. When buying new clothes, check to see if they will need to be dry cleaned. You will save money if you buy clothes that can be washed.
You can save money if you buy clothes that are well done. Well-made clothes last longer. They look good even after they have been washed many times. Clothes that cost more money are not necessarily(不一定) better made. They do not always fit better. Sometimes less expensive clothes look and fit better than more expensive clothes.The label inside the clothes tell you．
| A．how to keep them looking their best. |
B．how to save money. |
C．whether they fit you or not. |
D．where to get them dry cleaned. |
If you want to save money, you had better buy clothes that__________.
| A．don’t fit you | B．don’t last long |
C．need to be dry cleaned | D．can be wash |
We learn from the passage that cheaper clothes．
| A．are always worse made |
| B．must be dry cleaned |
| C．can not be washed |
| D．can sometimes fit you better |
Give the best title(标题)for this passage．
| A．Buy Less Expensive Clothes |
| B．Taking Enough Money When Shopping |
| C．Being a Clever Clothes Shopper |
| D．Choosing the Label inside New Clothes |