问题 单项选择题

共享数据库是一种重要的企业应用集成方式。以下关于共享数据库集成方式的叙述中,错误的是()

A.共享数据库集成方式通常将应用程序的数据存储在一个共享数据库中,通过制定统一的数据库模式来处理不同应用的集成需求

B.共享数据库为不同的应用程序提供了统一的数据存储与格式定义,能够解决不同应用程序中数据语义不一致的问题

C.多个应用程序可能通过共享数据库频繁地读取和修改相同的数据,这会使共享数据库成为一个性能瓶颈

D.共享数据库集成方式的一个重要限制来自外部的已封装应用,这些封装好的应用程序只能采用自己定义的数据库模式,调整和集成余地较小

答案

参考答案:B

解析:共享数据库是一种重要的企业应用集成方式,它通常将应用程序的数据存储在一个共享数据库中,通过制定统一的数据库模式来处理不同应用的集成需求。共享数据库为不同的应用程序提供了统一的数据存储与格式定义,能够在一定程度上缓解数据语义不一致的问题,但无法完全解决该问题。在共享数据库集成中,多个应用程序可能通过共享数据库频繁地读取和修改相同的数据,这会使数据库成为一个性能瓶颈。共享数据库集成方式的一个重要限制来自外部的已封装应用,这些封装好的应用程序只能采用自己定义的数据库模式,调整和集成余地较小。

阅读理解

根据短文内容,完成下列句子。

John: I'm 15 years old and I love football. I also like reading, especially (尤其是) stories about people

         from other countries. I don't enjoy singing or playing computers. I think that rock music is terrible.

Ann: Hi, I'm Ann. I'm 16 and I like dancing and computers. I also like rock music. I hate hiking and I'm

        not interested in classical music. I don't enjoy reading too much.

Steve: I'm 14 years old and I love skiing. Other favorite hobbies are reading and singing. I don't like

           hiking. I think that rock music is too noisy and I think that football is boring.

Peter: I'm from Australia. I'm 15 and I am fond of singing. I sing a lot, and when I'm not singing, I listen to

          rock music or use my computer. I don't like football and I think that classical music is terrible. I hate

          dancing!

Sarah: My name is Sarah and I'm 14 years old. My interests are reading novels, playing football and 

           singing songs. I think that rock music is terrible, and I don't like dancing. I don't enjoy computers,

           either.

Joe: Hi, I'm Joe. I really like computers. I surf the Internet all the time and I like playing computer games.

       I don't enjoy football and I hate hiking. Rock music is OK, and so is skiing.

1. Steve is a _____ boy, Ann is a _____ girl, but we don't know Joe's age.

2. _____, _____ and _____ don't like hiking.

3. John and Sarah could be friends, because they both like _____.

4. Ann and Sarah could not be friends, because they _____.

5. Who do you want to be friends with?

    _____, because _____.

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