问题 填空题

SQL语言采用  【12】  操作方式。例如,查询所有平均成绩在90分以上的学生姓名,用户必须说明完成该请求的具体处理过程,即如何用循环结构按照某条路径一条一条地把满足条件的学生记录读出来,而 SQL语言采用集合操作方式,不仅查询结果可以是元组的集合,而且一次插入、删除、更新操作的对象也可以是元组的集合(一次一个集合)。

答案

参考答案:(12) 集合

解析:解析:非关系数据模型采用的是面向记录的操作方式,操作的对象都是一条记录 (一次一个记录)。

阅读理解

In Britain you may often hear “Drop in any time.” or “Come to see me soon”, but you can’t really do that. People just say those things to make you feel welcome. It is better to telephone before visiting someone at home. If you receive a written invitation to an event that says “RSVP”, you should reply to let the person who sent the invitation know whether or not you plan to go.

You should never accept an invitation unless you really plan to go. You may refuse by saying, “Thank you for inviting me, but I will not be able to come.” If, after accepting, you are unable to go, be sure to tell those who are expecting you as soon as possible that you will not be there. Although it is not necessarily expected that you give a gift to your host, it is considered polite to do so, especially if you have been invited for a meal. Flowers, chocolate, or a small gift are all appropriate(合适的). A thank-you note or telephone call after the visit is also considered polite and is an appropriate way to express your appreciation for the invitation.

小题1:What can you do when a British friend says, “Drop in anytime”?

A.Visit him or her at any time.

B.Say no time to him or her seriously.

C.Telephone him or her before visiting.

D.Visit him or her soon.小题2:What does the underlined word “RSVP” probably mean in Chinese?

A.请自便

B.请回复

C.请审阅

D.请来访小题3:What should you do if your British friend sends you an invitation but you do not want to go?

A.Do not give him or her an answer.

B.Tell another friend to go instead of you.

C.Tell him or her that you can’t be there for some reason.

D.Tell him or her that you don’t want to go there.小题4:Which of the following is considered impolite in Britain?

A.Buy small presents when invited.

B.Refuse the invitation without telling anyone.

C.Write a thank-you note after a visit.

D.Give a telephone call after a visit.小题5:Where would you probably see this passage?

A.In an invitation.

B.In a guidebook.

C.On a poster.

D.In a newspaper.

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