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【单选题】

Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend Now you 1 do both at the same time. Home shopping television networks(网络) have become a 2 for many people to shop without 3 having to leave their homes.
Some shoppers are 4 of department stores and supermarkets— 5 the crowds, waiting in long lines, and sometimes 6 of finding anything they want to buy. They’d rather sit quietly at home in front of the TV set and 7 a friendly announcer describe a product 8 a model shows it. And they can 9 around the clock, buying something 10 by a phone call.
Department stores and even mail-under companies are 11 to join in the success of home shopping. Large department stores are busy 12 their own TV channels(频道) to encourage TV shopping in the future. 13 can ask questions about products and place 14 , all through their TV sets.
Will shopping by television 15 take the place of shopping in stores Some industry managers think so. 16 many people find shopping at a 17 store a great enjoyment. And for many shoppers, it is still important to 18 or try on dresses they want to buy. That’s 19 specialists say that in the future, home shopping will 20 together with store shopping but will never entirely replace (取代) it.

A.
ever
B.
never
C.
still
D.
once
题目标签:网络
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【单选题】计算机网络的功能主要体现在三个方面

A.
提高可靠性,提供负载均衡与分布式处理能力
B.
信息交换、资源共享、分布式处理
C.
A、 电子邮件、打电话、在网上举行视频会议
D.
A、 网卡 、 调制解调器 、 路由器

【单选题】若某工程网络计划的计算工期等于计划工期,则该网络计划中的关键工作是( )的工作。

A.
时标网络计划中没有波形线
B.
与紧后工作之间时间间隔为零
C.
最早完成时间等于最迟完成时间
D.
开始节点与完成节点均为关键节点

【单选题】以下的网络分类方法中,哪一组分类方法有误()

A.
 局域网/广域网
B.
 对等网/城域网
C.
 环型网/星型网
D.
 有线网/无线网

【单选题】最常用的网络控制有()

A.
数据加密
B.
授权
C.
防火墙
D.
病毒防护