问题 单项选择题

下列关于数据的逻辑结构的叙述中,哪一条是不正确的

A.数据的逻辑结构是数据间关系的描述

B.数据的逻辑结构反映了数据在计算机中的存储方式

C.数据的逻辑结构分为线性结构和非线性结构

D.队列属于线性结构

答案

参考答案:B

解析:数据的逻辑结构是数据间关系的描述,它只抽象的反映数据元素间的逻辑关系,而不管其计算机中的存储方式,故A项正确,B项错误。数据的逻辑结构分为线性结构和非线性结构。线性表是典型的线性结构,而树形结构是典型的非线性结构,所以C和D项正确。

阅读理解

(2013·高考广东卷,D)While Jennifer was at home taking an online exam for her business law class,a monitor(监控器)a few hundred miles away was watching her every move.

Using a web camera equipped in Jennifer’s Los Angeles apartment,the monitor in Phoenix tracked how frequently her eyes moved from the computer screen and listened for the secret sounds of a possible helper in the room.Her Internet access was locked-remotely-to prevent Internet searches,and her typing style was analyzed to make sure she was who she said she was:Did she enter her student number at the same speed as she had in the past? Or was she slowing down?

In the battle against cheating,this is the cutting_edge and a key to encourage honesty in the booming field of online education.The technology gives trust to the entire system,to the institution and to online education in general.Only with solid measures against cheating,experts say,can Internet universities show that their exams and diplomas are valid—that students haven’t just searched the Internet to get the right answers.

Although online classes have existed for more than a decade,the concern over cheating has become sharper in the last year with the growth of“open online courses.”Private colleges,public universities and corporations are jumping into the online education field.spending millions of dollars to attract potential students,while also taking steps to help guarantee honesty at a distance.

Aside from the web cameras,a number of other high­tech methods are becoming increasingly popular.Among them are programs that check students’ identities using personal information,such as the telephone numbers they once used.

Other programs can produce unique exams by drawing on a large list of questions and can recognize possible cheaters by analyzing whether difficult test questions are answered at the same speed as easy ones.As in many university classes,term papers are scanned against some large Internet data banks for cheating.

小题1:Why was Jennifer watched in an online exam?

A.To correct her typing mistakes.

B.To find her secrets in the room.

C.To prevent her from slowing down.

D.To keep her from dishonest behaviors.小题2:The underlined expression cutting edge in Paragraph 3 is closest in meaning to________.

A.advanced technique

B.sharpening tool

C.effective rule

D.dividing line小题3:For Internet universities,exams and diplomas will be valid if________.

A.they can attract potential students

B.they can defeat academic cheating

C.they offer students online help

D.they offer many online courses小题4:Some programs can find out possible cheaters by________.

A.checking the question answering speed

B.producing a large number of questions

C.scanning the Internet test questions

D.giving difficult test questions小题5:Which of the following is the best title of this passage?

A.The Advantages of Online Exams

B.The High­tech Methods in Online Courses

C.The Fight against Cheating in Online Education

D.The War against the Booming of Online Education

单项选择题