问题 单项选择题

Visual FoxPro的“参照完整性”中“插入规则”包括的选择是( )。

A.级联和忽略

B.级联和删除

C.级联和限制

D.限制和忽略

答案

参考答案:D

解析: 参照完整性与表之间的关联有关,它的大概含义是:当插入、删除或修改一个表中的数据时,通过参照引用相互关联的另一个表中的数据,来检查对表的数据操作是否正确。参照完整性规则包括更新规则、删除规则和插入规则。
插入规则规定了当在了表中的插入记录时,是否进行参照完整性检查:如果选择“限制”,若父表中没有相匹配的连接字段值,则禁止插入子记录;如果选择“忽略”,则不作参照完整性检查,即可以随意插入子记录。

阅读理解

Volunteering can help you deal with stress and problems, have more confidence, and introduce you to exciting new ideas and people. But what kind of volunteering should you do?

Firstly, think about what you enjoy. What are you interested in? What do you want to be when you grow up? For example, if you love animals, you can volunteer to care for abandoned(被遗弃的) pets or injured wildlife. If you want to grow up to be a doctor or a nurse, you can look for a youth volunteer program at a local hospital.

Secondly, think about what you’re good at. What skills do you have? What kinds of jobs do you do best? Try to find a volunteer position that will let you make the most of your strengths and talents. For example, if you’re a great speaker, then you could try educating others about a problem you care about. If you’re a cook, you might find a way to help feed hungry people in your area.

Thirdly, look for what your own community needs. What should be improved in your town, city, or school? What types of volunteer projects would do the most good? For example, if there are a lot of homeless people in your area, you could raise money to help them. If your town has empty areas filled with dirt or rubbish, you could organize or join a group to plant trees and flowers to make these areas more attractive.

The problems of the world, or even just of your community, might seem gigantic. Some people might even feel like there’s no point trying to do anything, since what they can contribute seems so small. But every person is important, and can do some good and make a difference. Like you!

小题1:What is the text mainly about?

A.How to be a good volunteer.

B.What we can do when we grow up.

C.What kind of volunteering one can do.

D.How to improve society by volunteering.小题2:The text does NOT mention _____ as a basis for volunteering. 

A.interests

B.abilities

C.people’s needs

D.what one gets in return小题3:The word “gigantic” in the last paragraph can be replaced by “_____”.

A. huge     B. serious    C. meaningless   d. different

小题4:How is the text mainly developed?

A.Through reasoning.

B.Through similarities.

C.Through examples.

D.Through explanations.

判断题