问题 单项选择题

数据库系统的核心是( )。

A) 数据库
B) 数据库管理系统
C) 模拟模型
D) 软件工程

答案

参考答案:B

解析: 数据库管理系统(Database Manaqement Syscem,DBMS)是数据库的机构,它是一种系统软件,负责数据库中的数据组织、数据操纵、数据维护、控制及保护和数据服务等,数据库管理系统是数据库系统的核心。

阅读理解

阅读理解。

     Many people have, to work on the weekend. Some people do not mind. Other people think it is terrible.

One man thinks that working on the weekend can be dangerous. He is John Brown. Mr. Brown works in

an office in New York.

     On Saturday, May 24, 1986, he went to the office to do some work. When he got in the elevator to go

home, it stopped between floors. Mr. Brown could not get out of the elevator. He was trapped (困住)! He

started to shout, but nobody heard him. Then Mr. Brown remembered that it was a holiday in America.

Nobody was going to come to work until Tuesday! There was nothing for Mr. Brown to do.

     He had to wait until one of his coworkers (同事) came to work and found him. With nothing to eat

or-drink, Mr. Brown ended up sleeping for most of the time.

     Early on Tuesday morning, the president of the company came into work and found the elevator was

not working. When the elevator was opened, Mr. Brown came out cold, weak, and tired. He had been in

the elevator for sixty-two hours!

     Now Mr. Brown says, "I only use elevators if they have telephones in them."

1. What does Mr. Brown think of working on the weekend?

A. It is happy.

B. He doesn't mind.

C. It can be dangerous.

D. He refuses to do it.

2. How long was he in the elevator?

A. From Saturday to Monday.

B. From Tuesday to Saturday.

C. More than three days.

D. More than two days.

3. Why did Mr. Brown spend so long in the elevator? Which of the following is NOT a reason?

A. It was a three-day holiday.

B. He had no food or drink.

C. The elevator stopped between two floors.

D. There was no telephone in the elevator.

4. How was Mr. Brown able to get out of the elevator?

A. The president discovered the elevator wasn't working.

B. The elevator started to work soon again.

C. His coworker who worked on the weekend helped him out.

D. His coworkers found him when they came back to work on Monday.

5. What is the best title (题目) for this story?

A. A Busy Weekend

B. An Interesting Elevator

C. Trapped in an Elevator

D. Elevator Safety

单项选择题