问题 单项选择题

关系数据库管理系统中的SQL语言是( )。

A.关系顺序查询语言

B.关系结构查询语言

C.关系描述语言

D.国际标准结构化查询语言

答案

参考答案:D

解析:[分析] 关系数据库SQL(Structured Query Language)是结构化查询语言,是介于关系代数和元组演算之间的一种语言,广泛应用于商用系统中,许多关系数据库产品如SQL/DS、DB2、Oracle, SYBASE等都实现了它的功能。SQL已经成为关系数据库的标准语言。

阅读理解

阅读理解(一)根据短文内容选择最佳答案。

     Today people can use the phone to talk with others almost anywhere on earth.But when you use the phone,you don't see the person you are talking with.That may change(改变)in the future.

     Now some people are using a kind of telephone called the picture phone or vision phone.With it,two people who are talking can see each other.

     Picture phones can be used when you have something to show to the person you are calling.They may have other uses(用途)in the future.One day you may be able to ring up a library and ask to see a book.Then you'll be able to read the book right over your picture phone.Or you may be able to go shopping through your picture phone,If you see something in the newspaper that you want to buy,you'll go to your phone and call the shop.People at the shop will show you the thing you arc interested in right over the phone.You'll be able to shop all over city and never even leave your room!

1.Today people can use the phone to talk with others __________.

A.in all the cities                    

B.in some places in the world

C.only in big cities                    

D.almost anywhere on earth

2.The underlined(划线的)word “it” in the article means __________.

A.the picture phone

B.any phone  

C.the use      

D.the change

3.We can __________ through the picture phone according to the article.

A.write a book      

B.do shopping    

C.play games

D.have glasses

4.Picture phones are very __________.

A.useful          

B.impossible      

C.bad          

D.badly

5.Which of the following is NOT true according to the article?

A.Today some people are using the picture phone or vision phone.

B.With the picture phone,two people can't see each other.

C.phones are very useful.

D.Today people can use phones to talk with each other almost everywhere on each.

选择题