问题 单项选择题

数据库管理系统中负责数据模式定义的语句是

A.数据定义语言

B.数据管理语言

C.数据操纵语言

D.数据控制语言

答案

参考答案:A

解析: 数据定义语言(Data Definition Language,DDL)用于定义数据库的所有特性和属性,尤其是行布局、列定义、键列(有时是选键方法)、文件位置和存储策略。

阅读理解

One day Mrs. Wilson went shopping with Tracy and Ben. They went to the supermarket in the new shopping center.

“Why do you buy things here?” Tracy wanted to know. “Because they are cheaper here than at the corner store near our home,” Mrs. Wilson said。” Help me check the prices, please.”

The Wilsons were not rich and Mrs. Wilson was always careful with her money. She looked carefully after the prices of things. She bought lots of things in the supermarket. When they got home, the children said,“ We don’t think you saved money by going to the supermarket.”

“Of course I did,” Mrs. Wilson said。. “Everything was cheaper there.” “We know,” the children said,“but we came home by taxi because we had too much to carry. The taxi fare was more than the money that you save! ”

Mrs. Wilson added everything up. Her children were right.

小题1:The things at the corner store were ______than those in the supermarket.

A.cheaper

B.nicer

C.more expensive

D.saved a little money小题2:Mrs. Wilson ______ in the end.

A.spent more money

B.paid less money

C.lost some money

D.saved a little money小题3:From the passage we know the children were _________.

A.happy

B.clever

C.tired

D.lazy小题4:Mrs. Wilson will _____________.

A.never call a taxi

B.go on buying things in the supermarket

C.buy things near her home

D.not go shopping with her children小题5:The best title for the passage is ____________.

A.Cutting Price

B.Corner Store

C.Supermarket

D.Shopping

单项选择题 A3/A4型题