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(嫌疑犯) 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 feel like I’m in a gold mine and I’m the only one who knows what gold looks like,” he says. “It’s a lot of fun.”
【小题1】
To find criminals, police usually ______.

A．focus on where crimes take place	B．seek help from local people
C．depend on new mathematical tools	D．check who are on the crime scene

【小题2】
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．shows changes in criminals’ patterns

D．provides the crime records of a given city

【小题3】
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 more criminals than other mathematicians

D．knows best how to use math to help solve crimes

【小题4】
What is the main idea of the text?

A．Criminals live near where crimes occur.

B．Math could help police find criminals.

C．Crime records could be used to fight crime.

D．Computer software works in preventing crimes.

阅读理解。

　　I was in a strange city I didn't know at all, and what's more, I could not speak a word of the language. On my second day I got on the first bus that passed, rode on it for several stops, then got off and walked on. The first two hours passed pleasantly enough. Then I decided to turn back to my hotel for lunch. After walking about for some time, I decided I had better ask the way. The trouble was that the only word I knew of the language was the name of the street in newspaper seller. He handed me a paper. I shook my head and repeated the name of the street and he put the paper into my hands. I had to give him some money and went on my way. The next person I asked was a policeman. He listened to me carefully, nodded and gently took me by the arm. There was a strange look in his eyes as he pointed left and right and left again. I nodded politely and began walking in the direction he pointed.

　　About an hour passed and I noticed that the houses were getting fewer and fewer and green fields were appearing on either side of me. I had come all the way into the countryside. The only thing left for me to do was to find the nearest railway station.

1．The writer preferred to walk back to his hotel because ________.

[　　]

A．he had no money to buy a ticket

B．he wanted to lose himself in the city

C．he tried to know the city in this way

D．it was late and there were no buses passing by

2．The newspaper-seller ________.

[　　]

A．didn't know where the hotel was

B．didn't understand what the writer said

C．could understand what the writer said

D．didn't want to take the money from the writer

3．From the story we know that the policeman ________.

[　　]

A．was kind but didn't know the way

B．told the writer where to take a train

C．knew what the writer really meant

D．was cold-hearted and didn't help the writer

4．What do you think would happen towards the end of the story?

[　　]

A．The writer got closer to the hotel where he stayed.

B．The writer got to the hotel with the policeman's help.

C．The writer found he was much farther away from the hotel.

D．The writer found the hotel in the direction the policeman pointed.

5．In your opinion, what was the writer's real trouble?

[　　]

A．He didn't know the city at all.

B．He couldn't speak the language.

C．He went too far in the wrong bus.

D．He followed the policeman's direction.

阅读理解。

　　I was in a strange city I didn't know at all, and what's more, I could not speak a word of the language. On my second day I got on the first bus that passed, rode on it for several stops, then got off and walked on. The first two hours passed pleasantly enough. Then I decided to turn back to my hotel for lunch. After walking about for some time, I decided I had better ask the way. The trouble was that the only word I knew of the language was the name of the street in newspaper seller. He handed me a paper. I shook my head and repeated the name of the street and he put the paper into my hands. I had to give him some money and went on my way. The next person I asked was a policeman. He listened to me carefully, nodded and gently took me by the arm. There was a strange look in his eyes as he pointed left and right and left again. I nodded politely and began walking in the direction he pointed.

　　About an hour passed and I noticed that the houses were getting fewer and fewer and green fields were appearing on either side of me. I had come all the way into the countryside. The only thing left for me to do was to find the nearest railway station.

(1)The writer preferred to walk back to his hotel because ________.

[　　]

A．he had no money to buy a ticket

B．he wanted to lose himself in the city

C．he tried to know the city in this way

D．it was late and there were no buses passing by

(2)The newspaper-seller ________.

[　　]

A．didn't know where the hotel was

B．didn't understand what the writer said

C．could understand what the writer said

D．didn't want to take the money from the writer

(3)From the story we know that the policeman ________.

[　　]

A．was kind but didn't know the way

B．told the writer where to take a train

C．knew what the writer really meant

D．was cold-hearted and didn't help the writer

(4)What do you think would happen towards the end of the story?

[　　]

A．The writer got closer to the hotel where he stayed.

B．The writer got to the hotel with the policeman's help.

C．The writer found he was much farther away from the hotel.

D．The writer found the hotel in the direction the policeman pointed.

(5)In your opinion, what was the writer's real trouble?

[　　]

A．He didn't know the city at all.

B．He couldn't speak the language.

C．He went too far in the wrong bus.

D．He followed the policeman's direction.