2. 计算机
  3. Early computer networks used leased telephone company lines for their connections．The U．S．Defense Department was concemed about

Early computer networks used leased telephone company lines for their connections．The U．S．Defense Department was concemed about

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问题 Early computer networks used leased telephone company lines for their connections．The U．S．Defense Department was concemed about the inherent risk of this single-channel method for connecting computers，and its researchers developed a different method of sending information through____①____channels．In 1969，Defense Department researchers in the Advanced Research Projects Agency(ARPA)used this network model to connect four computers into a network called the ARPANET．The ARPANET was the earliest of the ___②_____ that eventually combined to become what we now call the Internet．
The Interact provides only the physical and logical infrastructure that  ___③_____  millions of computers together．Many believe that the World Wide Web(WWW，or simply the Web) provides the killer application(制胜法宝)for this global network．The Web is considered the content of the ____④____ ，providing all sorts of information by using a rich set of tools that manage and link text，graphics，sound，and video．Providing and viewing information on the Web is accomplished using server applications and client applications．
If you’ve already explored the Web，you’ll recognize the client-side application as the Web browser.A Web browser receives，interprets，and displays  ____⑤____ of information from the Web．
The user can navigate within pages，jump to other pages by clicking hypertext links，and point to just about any page on the Web．
⑤
选项 A、pages
B、applications
C、navigations
D、hyperlinks
答案A
解析 早期的计算机网络使用租用的电话公司线路进行连接。美国国防部担心这种连接计算机的单通道方法的固有风险，其研究人员开发了另一种通过多通道发送信息的方法。1969年，美国高级研究计划局(ARPA)的国防部研究人员使用此网络模型将四台计算机连接到称为ARPANET的网络中。ARPANET是最早的网络，最终合并为我们现在称为Internet的网络。因特网只是提供了将许许多多计算机连接在一起的物理与逻辑基础结构。不少人认为，是万维网(WWW或简称Web)为这个全球网络提供了“制胜法宝”。万维网被视为因特网的内容，它通过使用管理与链接文本、图形、声音和视频的一套丰富工具来提供各种信息。使用服务器应用程序和客户应用程序完成在万维网上提供和查看信息。如果你已经探索过万维网，你就会看出客户端应用程序就是万维网浏览器。万维网浏览器接收、解释和显示来自万维网的网页信息。用户可以在网页之内浏览，可以通过点击超文本链接跳到其他网页，也可以指向万维网上的几乎任何网页。
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