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.

阅读理解

　　Good morning. I'm speaking to you today from Beijing. In just two days, I've seen some of the rich history and remarkable changes that are taking place in China, home to nearly one- quarter of the world's population.

　　China is the oldest civilization on Earth. In Xi'an, on Friday, I saw the old and the new China, from magnificent Terra Cotta Warriors sculpted by artisans 2,000 years before America was founded, to the beginnings of democracy in a nearby village, where residents soon will hold elections.

　　I've been touched by the warm reception given to me, my family, and the members of Congress travelling with us. Tens of thousands of Chinese families have lined the streets to greet us. For all these people, China is changing. I see cell phones, beepers, new office buildings.

　　China is no longer the same country it was when president Nixon first came here 26 years ago. Never before have so many Chinese had the opportunity to start businesses, lift their families out of poverty, choose where to live, work, and travel, and enjoy the fruits of their labors.

　　Today in Beijing I am meeting with China' s leaders to talk about the future of our two countries and a relationship between us that is essential to a peaceful, stable, and prosperous world in the next century. We talked about the United States and China's mutual interests ---- promoting peace in Korea, where 400,000 U.S. soldiers still risk their lives to patrol the Cold Wars last frontier; preventing a nuclear arms race between India and Pakistan; restoring economic stability in Asia; stopping the spread of unclear soldiers chemical, and biological weapons and the misspread of unclear soldiers chemical, and biological weapons and the missiles to deliver them; combating international crime and drug trafficking; preserving the environment; and opening trade.

　　China is important to our future, with the largest population on Earth, a permanent seat on the United Nations Security Council, an economy increasingly connected to our own. Without China, it will be difficult to face the challenges. In dealing with China, we must stay true to a course that is both principled and pragmatic．We must continue to expand our areas of cooperation, even as we deal directly with out differences. With China, we can build a safer, more prosperous future for our children, a world of unlimited possibility in the new century

　　Thanks for listening.

(1)When was the Terra Cotta in Xi'an sculpted?

[　　]

A．2,000 years ago.

B．On the beginning of the last century.

C．2,000 years before America was founded．

D．Right before Clinton's visit to China．

(2)Who traveled together with Clinton in China?

[　　]

A．His family.

B．His family and some congressmen.

C．Members of congress.

D．Reporters and bodyguards.

(3)Which of the following issue was NOT discussed by President Clinton and China's leaders during his visit in Beijing?

[　　]

A．peace in KoreA．

B．Asian economy.

C．American human rights.

D．prohibition of nuclear weapons.

(4)Which of the following impressed the president most during his visit in China?

[　　]

A．Rich history and remarkable changes of China．

B．Modern communication facilities of China．

C．Democracy progress of China．

D．Economic development of China．

(5)According to the president's address, why is China important to the U. S.?

[　　]

A．Because China has the largest population in the world．

B．Because China has a permanent seat on the United Nations Security Council.

C．Because China and the U.S. have mutual interests in the economic development.

D．All of the above.

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

— What a tiring evening!

　　 — Oh, it's good to sit down after all that standing.

　　 —   1  

　　 — I don't think I've ever felt so tired in my life.   2____

　   — And the heat. _3______

　　 — We shouldn't have accepted the invitation in the first place.

　　 — ____4   We've only been to a party.

　　 — You're right. We must be getting old.

　　 — Come on. ___5    We'd feel better.

　　A．I'm not that tired.

　　B．Let's have some coffee.

　　C．What 's more, I didn't sleep well last night.

　　D．But we shouldn't have felt so tried.

　　E．A good night's sleep will put you right again.

　　F．I could just sit here for ever and ever, and never get up.

　　G．All that silly talk, and the drink and the cigarette smoke

短文改错（共10小题；每小题1分，满分10分）

 　

   Dear Ralph,

I'm a newcomer here of a small town. I would               1. _____

describe myself as shy and quietly. Before my classmates,     2. _____

it always seems difficult for me to do things well as        3. _____  

them. I'm sure they will laugh to me and see me as           4. _____

a fool. So I feel unhappy every day.                      5. _____ 

Besides, I have few friends. I don't know that they           6. _____

don't like to talk with me. Sometimes, we talked to each other  7. _____ 

very well in class, but after class we become stranger at      8. _____

once. I am trying to improve the situation since it doesn't     9. _____

seem to work. Can you tell me about what I should do?       10. _____

Yours,    

Xiao Wei