问题 单项选择题

分布式数据库系统不具有的特点是______。

A.分布式

B.数据冗余

C.数据分布性和逻辑整体性

D.位置透明性和复制透明性

答案

参考答案:B

解析:[知识点] 数据库系统的基本概念[评析] 分布式数据库系统具有数据分布性、逻辑整体性、位置透明性和复制透明性的特点,其数据也是分布的;但分布式数据库系统中数据经常重复存储,数据也并非必须重复存储,主要视数据的分配模式而定。若分配模式是一对多,即一个片段分配到多个场地存放,则是冗余的数据库,否则是非冗余的数据库。

填空题
阅读理解

It happened to me recently that I was telling someone how much I had enjoyed reading Barack Obama’s Dreams from My Father and how it had changed my views of the current US president. The person I was talking to agreed with me that it was, in his words, “a wonderfully written book”. However, he then proceeded to talk about Mr. Obama in a way that suggested he had no idea of his background at all. I sensed that I was talking to a book liar.

And it seems that he is not the only one. Clearly two thirds of people have lied about reading a book which they haven’t. In the World Book Day survey, Dreams from My Father is at number 9. The survey lists top ten books, and various authors, which people have lied about reading. As I’m not one to lie too often, I’ll admit here and now that I haven’t read the entire ten books. But I am pleased to say that I have read the book at number one, George Orwell’s 1984. I think it’s absolutely outstanding.

Asked why they lied, the most common reason was to impress someone they were speaking to. This could be difficult if the conversation became more in depth!

The World Book Day survey also has some other interesting information in it. It shows that many people lie about having read classical works by Jane Austen, the Bronte sisters, Charles Dickens and so on. But when asked which authors they actually enjoy, they named J.K. Rowling, Jilly Cooper, and Stephen King (ah, the big sellers, in other words). Forty-one percent of people asked admitted they turned to the back of the book to read the end before finishing the story.

So which books have you lied about reading — if any — and which is your favourite?

1.The main reason why people lie about reading is to _________.

A. make fun of the listener                 B. impress the listener

C. please the listener                      D. interest the listener

2.The underlined word “proceeded” in the passage probably means “_________”.

A. wanted           B. happened         C. continued            D. stopped

3.What does the World Book Day survey show?

A. Nearly half of the people surveyed didn’t read through a whole classical book.

B. People don’t like Dreams from My Father and George Orwell’s 1984.

C. Few people lie about having read classical works by Jane Austen.

D. People usually enjoy reading books by Charles Dickens.

4.What is the best title for the passage?

A. Are You a Book Liar?                 B. Readers Are All Liars

C. World Book Day                       D. Dreams from My Father