问题 单项选择题

“年龄在18-25之间”这种约束是属于数据库当中的

A.原子性措施

B.一致性措施

C.完整性措施

D.安全性措施

答案

参考答案:C

解析:【命题目的】对数据库各种特性必须有正确的理解。【解题要点】数据库的完整性是指数据的正确性和相容性(如学生的学号必须惟一,性别只能是女或男等),数据库是否具备完整性关系到数据库系统能否真实反映现实世界,因此维护数据库的完整性是非常重要的。【考点链接】数据库的各种特性及表达形式。

单项选择题 A1型题
阅读理解

Dickens & London Exhibition

Date: 9 December, 2011---10 June, 2012

Location: Museum of London

Celebrate the 200th anniversary of the birth of Charles Dickens in the first major UK exhibition for his Over 40 years.

By recreating the atmosphere of Victorian London through sound and projections. You’ll be taken on an unforgettable journe y to discover the city that inspired his writings.

Paintings, photograghs, costumes and objects will illustrate different themes that Dickens wrote into his works, while rarely seen manuscripts(手稿) including Bleak House and David Copperfield ---written

in the author’s own hand ---will offer clues to his creative genius.

During your visit you’ll discover how Dickens’ childhood experiences of London were introduced into the stories he wrote. The great social questions of the19th century will also be examined, all of which set the scene for Dickens’ greatest works.

Highlights of the exhibition will inc1ude an exciting audio-visual experience bringing to life the desk and chair where Dickens worked on his nove1s, and a special film shot by one of the UK’s leading documentary filmmakers.

Packages include afternoon entry (1:00 pm ---4:00 pm) to the exhibition plus overnight accommodation at a nearby hotel. If you wish to visit the exhibition the day after your hotel stay, p1ease call our reservation department. Call: 08712212717.

Book a trip online with us, with tickets to Dickens & London Exhibition ---afternoon entry and hotel accommodation included in the price. All taxes included. No credit card fees. No booking fees. No discount.

Price Information: a package costs an adult £180 and a child £90 ( 4---15 ) ; an afternoon entry costs an adult £28 and a child £14 ( 4---15 ).

小题1:During the visit, visitors can ___________________

A.read three Dickens’manuscripts,

B.experience a vivid picture of Victorian London

C.find the great social problems in London at present

D.sit at the desk where Dickens worked hard on his novels小题2:What do we know about Dickens in this passage?

A.He used to be a filmmaker .

B.He lived a hard life in his childhood.

C.He wrote different themes into his works.

D.He wrote social violence into his books.小题3:If we book a trip online, we have the following benefits EXCEPT that ___________ .

A.we can book it free of charge

B.we will pay none of the taxes

C.we will pay none of credit card fees

D.we will be given a discount小题4:How much should a couple with one child at 10 and another at 18 pay if they have a package ?

A.£360

B.£540

C.£630

D.£720