问题 单项选择题

数据的独立性包括( )。

A.数据的结构独立性和组织独立性

B.数据的结构独立性和数据的逻辑独立性

C.数据的物理独立性和数据的逻辑独立性

D.数据的结构独立性和数据的物理独立性

答案

参考答案:C

解析: 数据的独立性是数据库领域的一个常用的术语,包括数据的物理独立性和数据的逻辑独立性。数据的物理独立性是指用户的应用程序与存储在磁盘上的数据库中的数据是相互独立的,也就是说,当数据的物理存储改变时,应用程序不变。数据的独立性是指用户的应用程序与数据库的逻辑结构是相互独立的,也就是说,数据的逻辑结构改变了,用户程序也可以不变。

完形填空

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The summer holiday is coming, which can be a relaxing time for sleeping, eating good meals and seeing old friends. Try to take some time off from school and spend a few weeks of fun. Here are some ideas for planning your summer holiday.

First of all, joining a club is a good choice! You can join a music club, a sports club or an art club. It’s good for your future development and the teachers in the club can give you good advice.

Doing something good for society is also great. There are many volunteer(志愿的) programmes for you to choose from, such as looking after the old or the young, cleaning the streets, planting trees or keeping the traffic in order. You know that teens can also make the world better.

Have you ever lived with another family? You can join in a programme called “Meeting a New Family”.Two families exchange their children for some time so that they can learn how to get on well with others.

Summer camp is still popular today. An English summer camp may be a good choice. You can not only make friends but also practise your English.

小题1: The writer gives some ideas for ______your summer holiday.

小题2: to learn drawing, you can join an ______club.

小题3: Teens can make the world better by ______as volunteers.

小题4: In an English summer camp you can ______your English.

小题5:If you are one of the children in the programme “Meeting a New Family”,you ______live with you own parents for some time.

选择题