问题 单项选择题

下列叙述中,正确的一项是______。

A.Word文档不会携带计算机病毒

B.计算机病毒具有自我复制的能力,能迅速扩散到其他程序上

C.清除计算机病毒的最简单的办法是删除所有感染了病毒的文件

D.计算机杀病毒软件可以查出和清除任何已知或未知的病毒

答案

参考答案:B

解析: 计算机病毒有不同的种类,有感染可执行文件或引导区的病毒,也有感染Word文档文件和模板文件的病毒。清除计算机病毒简单有效的方法是使用杀毒软件,但杀毒软件只能检测出已知病毒并消除,不能检测出新的病毒或病毒的变种。

阅读理解

根据短文内容,回答下面几个问题 。

     Sam hated doing chores. And he had many chores. For example, on Mondays, Wednesdays and

 Fridays he took out the trash. And on weekends he always washed his father's car. He also cleaned his

 own room once a week. What a chore that was sometimes he even had to look after his little sister and

 brother.

    Sam had a foreign friend at school. His name was Kumar. Doing chores in Kumar's family was very

 different. In the house only the girls did chores. His sisters made all the beds and cleaned all the rooms

 ,too, even his bedroom. His mother always cooked the meals, and his sisters helped her to go shopping,

 and prepare the food. They worked hard at home, doing all the chores with their mother. So when Kumar

  talked to his friend Sam about chores, he felt very lucky.

     One day, Sam had an idea. He asked Kumar, "Could I borrow your sisters?" He wanted them to help

  him clean his room, but they said "no". Instead (相反),  they asked Sam to teach their brother how to do

 chores, so he could make his own bed.

     Sam and Kumar are very good at science. They are going to be scientists after university. They want to 

 make a robot to clothe chores, Then everyone, mothers and fathers, sons and daughters will be happy!

1. When did Sam take out the trash?

                                                                                   

2. How often did he clean his room?

                                                                                   

3. What did Kumar's sisters do in the house?

                                                                                    

4. Why did Sam want to borrow Kumar's sisters?

                                                                                     

5. What are Sam and Kumar going to do to help with the chores?

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