问题 单项选择题

以下关于计算机病毒防治方面的论述中,正确的是 (17)

A.只要不使用U盘,就不会使操作系统感染计算机病毒
B.及时更新操作系统补丁包有助于计算机病毒的防治
C.移动硬盘比U盘更容易感染计算机病毒
D.设置写保护后使用u盘就不会使操作系统内的文件感染病毒了

答案

参考答案:B

解析: 在日常生活中,常见的一种误解是,认为只要不使用U盘、移动硬盘和软盘等移动媒体,就不会使系统感染病毒。这是错误的,系统感染病毒有多种途径,尤其是现在通过网络传播病毒越来越严重,并不是仅依靠这些移动媒体传播病毒。是否更容易感染病毒与使用移动硬盘还是U盘没有直接关系。
在使用U盘时设置写保护,这样系统只能够读取U盘上的文件,而不能向U盘中写入任何数据,可以有效防止U盘中的文件被计算机病毒感染,但可能因为U盘中原先存在的感染病毒的文件被读写到操作系统,而使操作系统内的文件感染相应的病毒。
在计算机的日常使用中,应该及时升级计算机操作系统,下载安装补丁包,以弥补系统缺陷和漏洞,这一措施将有助于计算机病毒的防治。

阅读理解

Once there was a huge apple tree. A little boy loved to come and play around it every day. He loved the tree and the tree loved to play with him.

Time went by — the little boy had grown up and he no longer played around the tree every day. One day, the boy came back to the tree and he looked sad. “Come and play with me,” the tree asked the boy. “I’m no longer a kid. I wouldn’t play around the tree any more.” the boy replied. “I want toys. I need money to buy them.” “Sorry, I don’t have money. But you can pick all my apples and sell them. So, you will have money.” The boy picked all the apples on the tree and left happily. The boy never came back after he picked the apples.

One day, the boy returned and the tree was so excited, “Come and play with me,” the tree said. “I don’t have time to play. I have to work for my family. We need a house for shelter. Can you help?” “Sorry, I don’t have a house. But you can cut off my branches to build your house.” So the boy cut all the branches off the tree and left happily. The tree was glad to see him happy but the boy never came back since then. The tree was again lonely and sad.

One hot summer day, the boy returned and the tree was pleased. “Come and play with me!” the tree said. “I am sad and getting old. I want to go sailing to relax myself. Can you give me a boat?” “Use my trunk to build your boat. You can sail far away and be happy.” So the boy cut the tree trunk to make a boat. He went sailing and never showed up for a long time.

Finally, the boy returned after he left for so many years. “Sorry, my boy. But I don’t have anything for you any more. The only thing left is my dying root,” the tree said with tears ①

“Good! Old tree root is the best place to lean on and rest. Come and sit down with me and rest.” The boy sat down and the tree was glad and smiled with tears ② ……

小题1:Why did the boy pick all the apples on the tree? Because __________.

A.he wanted to eat them

B.he needed money to buy toys

C.he liked the tree without apples

D.he wanted to share them with friends.小题2:When did the boy come back to the apple tree? He came back _________.

A.whenever he was happy

B.if he missed the apple tree

C.when he was in times of difficulty

D.as soon as he was free小题3:What did the boy want at last? He wanted ___________.

A.to have a house to live in

B.nothing except a place to rest

C.the root of the apple tree

D.anything that the apple tree had小题4:What can we learn from the story? We should _________.

A.plant more apple trees

B.learn from the boy

C.always stay at home

D.be thankful to our parents小题5:According to the passage, which of the following is NOT true?

A.The phrase “with tears ①” means that the apple tree was sad because the boy asked for too much.

B.The phrase “with tears ②” means that the apple tree was still happy because she could help the boy for the last time.

C.Each time the boy asked the apple tree for help, the tree tried her best to satisfy him.

D.After reading the passage, we can easily think of the old Chinese saying “Parents’ love is universal!”

单项选择题