问题 单项选择题

下面关于网络信息安全的—些叙述中,不正确的是______。

A.网络环境下的信息系统比单机系统复杂,信息安全问题比单机更加难以得到保障

B.电子邮件是个人之间的通信手段,有私密性,不使用软盘,—般不会传染计算机病毒

C.防火墙是保障单位内部网络不受外部攻击的有效措施之—

D.网络安全的核心是操作系统的安全性,它涉及信息在存储和处理状态下的保护问题

答案

参考答案:B

解析:[知识点] 浏览器、电子邮件及Web服务器的安全特性[评析] 随着电子邮件的日益普及,越来越多的病毒通过电子邮件传播,和传统的软盘传播病毒比起来,通过电子邮件传播病毒无论是传播速度还是传播范围都远非前者所可望其项背。这也是互联网时代病毒传播的最大特点。

阅读理解

阅读理解。

      Mr Young worked in a factory.  He was an able (有能力的) worker and could get more money than

  his workmates.  His wife was able,  too.  She did all the housework and took good care of her

 children.  They were never worried about food or clothes.  But they were both miserly (吝啬) and tried to

  save everything.  Their family wore old and broken clothes.  He always went to work and their children

  went to school on foot.

    One afternoon, while Mrs Young was cooking supper, she heard the bell.  A man said on the

 telephone,  "I'm sorry to tell you something unlucky.  Your husband died in an accident. "

    The woman hardly believed her ears.  "When did it happen?" she shouted sadly.  "At four, Mrs Young. "

    "It's half past five!" the woman said angrily.  "Why didn't you tell me about it an hour ago? I've cooked

 supper for him ! "

     "Everything was confused (混乱的) here at that moment and all of us forgot it. "

     "What were his last words? "

     "He asked us to retell you he wouldn't go back for supper!"

1. Mr Young was able, so_____.

    A.  he wore old clothes            

    B.  he spend twenty to work on foot

    C.  he lived a happy life          

    D.  he got more money

2. Mr Young's children went to school on foot because_____.

    A.  they were poor

    B.  his parents tried to save money

    C.  there were no buses in the town

    D. they hoped to do morning exercises

3. Mrs Young began to cook supper at_____.

    A.  four      

    B.  half past four      

    C.  five      

    D.  half past five

4. The phrase "last words " in the story means_________.

    A. 最后一些词语            

    B. 最后一些话

   C. 遗言                    

    D. 嘱托

5. Mrs Young became angry because          .

    A. she wasn't told about the bad news before she cooked supper.

    B.  the factory didn't retell her husband's last words in time.

    C.  she couldn't see her husband before he died.

    D.  she didn't know whether her husband's last words were real.

单项选择题