1、电子图书科技英语强化听力与口语单元2 网络Unit 2 The Internet,1. What is the Internet? is a global system of interconnected computer networks. -Wikipedia 维基百科2. What is the use of the Internet?,Free talk,Discussion: What do you often do with the Internet? CommunicationInformation searchingEntertainmentE-CommerceOther se
2、rvices,Internet surfing,Task 1: Discourse reading(Discuss & Read) Analyze the picture,“This diagram represents a wide area network or WAN.”WAN - Wide Area Network 广域网LAN - Local Area Network 局域网,3. How does the Internet work?,The Discourse: Comparison（对比） & Contrast （对照）,This diagram represents a wi
3、de area network or WAN. Two networks are linked via satellite. One network is in Barcelona and consists of a central computer and various PCs. The other LAN is in Los Angeles and contains a central computer and several clients. In Los Angeles, the computers are connected to the telephone lines by a
4、modem. However, in Barcelona, the network is linked to fibre-optic cables. The satellite receives signals from the dish aerials. Then the signals are retransmitted to workstations in Barcelona or Los Angeles. The purpose of this integrated network may be to establish communications services on a tra
5、nscontinental scale. It allows large companies and institutions to exchange information over long distances.,Discussion: What do you often do with the Internet? CommunicationInformation searchingEntertainmentE-CommerceOther services,Internet surfing,Advantages of the Internet,Advantages and Disadvan
6、tages of the Internet,CommunicationInformation searchingEntertainmentE-CommerceOther services,Task 2: Listening comprehension,AWarningAboutWirelessInternet,Wireless Fidelity 无线保真 fideliti,3rd-generation,The communications industry is warning computer users to guard against a new way to steal private
7、 information. They say this kind of theft is increasing. Thieves are linking their computers with other computers and stealing information that can cost honest computer users a great deal of money. They are doing this by using the most modern computer communications method - Wi-Fi. Wi-Fi is a short
8、way of saying wireless fidelity. Wi-Fi permits computer users to link with the Internet communications system without using wires and a telephone.,AWarningAboutWirelessInternet,One method used by thieves to steal such information is called the evil twin. Security experts say another method used by t
9、hieves is to gather information by reading a computer screen. Thieves do this in a public place. They have even used video cameras to record the information they are trying to steal. Experts say it is easy to guard against this kind of theft. They say to make sure no one can read your computer scree
10、n while you are working in a public place. Other methods of protecting your information involve special computer programs. One of these is called a firewall. A firewall prevents anyone from electronically entering your computer to search for information. Some programs make your computer invisible to
11、 anyone on the Internet. Most also block any attempt to spy on your Internet activities.,One expert says more than half the computers in the United States that are used for business lack protection and could be attacked. Information theft from wi-fi connections is a problem for computer users everyw
12、here. Most experts agree that computer users should learn how to protect their computers and information from those who would spy or steal. Industry experts say only education and good security will stop information theft.,Advantages and Disadvantages of the Internet,CommunicationInformation searchi
13、ngEntertainmentE-CommerceOther services,Theft of personal information,Virus threat,Junk mail / spamming,Unhealthy contents / Pornography p: ngrfi:,Addiction to the Internet,Writing,1.陈述利弊的常见句型 （详见阅读与写作） 1.1 说明优点 An advantage of is that + 句子 （.的优点是.） It has the following advantages. It does us a lot
14、of good. It benefits us quite a lot. It is beneficial to us. 1.2说明缺点 It has more disadvantages than advantages. The disadvantages outweigh its advantages. It does us much harm. It is harmful to us.,2.拓展句/ 支持句的写作方法 Example We can communicate in a fraction of second with a person who is sitting in the
15、 other part of the world by e-mail, and MSN the instant chatting provider. We also can chat for hours with our loved ones. There are plenty messenger services in offering.,3. 列举法,WWW: World Wide Web 万维网IP: Internet Protocol 网络传输协定 HTTP: Hypertext Transmission Protocol 超文件传输协定BBS: Bulletin Board Syst
16、em （电子）公告牌系统E-Mail: Electronic - Mail电子邮件FTP: File Transfer Protocol 文件传输协定,2.Abbreviations for technical terms in computer,Task 3: Vocabulary,Text A The Internet P 28 Ex I Ex II Ex IV,Assignment,Text A The Internet,Task 1: Do the following statements agree with the information given in the passage?
17、 write:TRUE if the statement agrees with the informationFALSE if the statement contradicts the informationNOT GIVEN if there is no information on this,1. The Internet originated from a national network designed for military emergency. (Para 2) It was started in 1969, when the U.S. Department of Defe
18、nse established a nationwide network to connect a handful of universities and contractors. The original idea was to increase computing capacity that could be shared by users in many locations and to find out what it would take for computer networks to survive a nuclear war or other disaster by provi
19、ding multiple path between users.,T,2. Remote computation and communication facilities enable us have access to all kinds of online information. (Para 4) The network facilities resources provide us the ability of remote computation and communication.,逻辑关系颠倒,F,3. If you dont know how different comput
20、ers are linked to each other, you cant use them to exchange information online. (Para 5) What you need to know is that you can exchange message with other computers on the Internet and use your computer as a remote terminal on distant computers. But the internal details of the link are less importan
21、t, as long as it works.,F,4. A unique address for each computer is needed for people to connect them together on a network. (Para 5) If you connect computers together on a network, each computer must have a unique address, which could be either a word or a number. For example, the address of Sams co
22、mputer could be Sam, or a number.,T,句型转换：条件从句-目的状语,5. The Internet is such a huge interconnected system that many operating methods like the Unix should be developed to promote data move between different computers. (Para 6) The Internet is a huge interconnected system, but it uses just a handful of
23、 method to move data around. Until the recent explosion of public interest in the Internet,.,F,6. E-mail is the most commonly used network service because it is cheap and sufficient. (Para 7) The most commonly used network service is electronic mail (E-mail), or simply as mail. Mail permits network
24、users to send textual messages to each other. Computers and networks handle delivering the mail, so that communicating mail users do not have to handle details of delivery, and do not have to be present at the same time or place.,NG,7. The quality of your Internet connection and service depends on h
25、ow much you are willing to spend on your computer. (Para 10) Naturally, the quality of your Internet connection and service, like many other things in life, is dictated by the amount of money that you are willing to spend.,F,限定语,8. As a result of technological advances, online information continues
26、to grow. (Para 13) As more and more systems join the Internet, and as more and more forms of information can be converted to digital form, the amount of stuff available to Internet users continues to grow.,T,9. It is tradition that Internet users help each other in a cooperative way. (Para 13) At so
27、me points very soon after the nationwide (and later worldwide) Internet started to grow, people began to treat the Net as a community, with its own tradition and customs.,F,Task 1: Do the following statements agree with the information given in the passage? write: 1. F 2. F 3.F 4.T 5. F 6. NG 7. F 8
28、. T 9. T,Task 2: Complete e the following sentences with the information given in the text.,1. People on the ARPNET discovered that they can use the network to do such things as exchanging messages and conducting electronic conferences , which have nothing to do with its original military purpose.2.
29、 People use Mail to send textual messages while using Telnet to set up a remote terminal connection .3. Besides LAN and a telephone line, a high-speed data communication circuit and a radio channel may also be used to transmit data between PCs and the Internet.,Task 3: Translation,1. The original id
30、ea was to increase computing capacity that could be shared by users in many locations.（增加计算机能力, 由许多地点的用户共享）.2. Today thousands of networks and millions of computers are connected to the Internet（与Internet 相连）.,汉英分句、从句的互译,被动语态的翻译,3.The network resources can be divided into network facilities resource
31、s and network information resources.（可以分为网络设备资源和网络信息资源）.4. But the internal details of the link are less important, as long as it works （只要网络能工作就行）.,被动语态、词组的翻译,固定表达的翻译,5. Although all these services can well satisfy the needs of the users for information exchange,（可以很好地满足用户对信息交换的需要）, a definite requirement is needed for the users.6. Somebody else gathered list of frequently asked questions and placed it where newcomers could find it.（新来者能找到的地方）.,重点词汇的翻译,名词从句的翻译,Word Puzzle,P A S W O R D,F R E W A R E,H A K E R S,V I R S,E N C Y P T I O N,F R E W A L L,A T A C H M E N T,D E C R P T I O N,
