问题 单项选择题

( )是指对网络提供某种服务的服务器发起攻击,造成网络的“拒绝服务”或丧失服务能力,致使网络工作不正常,甚至完全不能工作。

A.服务攻击

B.非服务攻击

C.对象攻击

D.非对象攻击

答案

参考答案:A

解析: 在Internet中主要有以下两种攻击类型:服务攻击和非服务攻击。服务攻击是指对网络提供某种服务的服务器发起攻击,造成网络的拒绝服务或丧失服务功能,只是网络不能正常工作,甚至完全不能工作,如题目中所述现象;非服务性攻击是攻击者可能使用各种方法对网络通信设备发起攻击,使得网络通信设备或线路出现严重阻塞或瘫痪。因此本题题干所述内容属于服务攻击,正确选项为A。

阅读理解

阅读理解。

  Word travelled quickly in the small fishing village of Port Washington,

Wisconsin. So when McCarty wanted to build a playground for kids with special

needs. 2,800 people ? a third of the town ? rolled up their sleeves(衣袖)and

helped her.

  "A lot of learning comes through play," said McCarty, 52, a special

education teacher for 28 years. But her students were too often left out. She'd

seen the traditional playgrounds stop wheelchairs dead in their tracks.

  On September 16, 2008, the first day of the project, they came. Two women

heard about the project on the way to work and took the day off to help. A couple

in their 80s took part in the job. Children came and gave a helpful hand. Many

were volunteers. They all worked very hard.

  Today, Possibility Playground is one of the most popular destinations in

Ozaukee County. All children can play shoulder to shoulder. There is special

equipment(装置) in different parts. Here, you see all the kids on the same

playground having fun.

  "People used to ask. 'Why do you want to build a playground just for

children with disabilities?' " McCarty said. "They didn't get it. It's only when you

build a playground for children with disabilities that you build one for all

children."

1. What's McCarty?

A. A special doctor.          

B. A special education teacher.

C. A special singer        

D. A special designer.

2. How many people are there in the town?

A. About 4,200 people.    

B. About 700 people.

C. About 8,400 people.  

D. About 2,800 people.

3. What does the underlined word mean?

A. 目的地      

B. 出发地      

C. 游乐场      

D. 体育场

判断题