Unit 3　Section A　Listening and Speaking （新教材）人教版2019必修第二册同步课件(共31张PPT).pptx

1、UNIT 3 THE INTERNET 素养导航 主题语境人与社会 科学与技术 The Internet The Internet,a system architecture that has revolutionized communications and methods of commerce by allowing various computer networks around the world to interconnect.Sometimes referred to as a “network of networks”,the Internet appeared in the

2、United States in the 1970s but did not become useful to the general public until the early 1990s.By 2015,about 3.2 billion people,or nearly half of the worlds population,can have access to the Internet. The Internet provides a capability so powerful and general that it can be used for almost any pur

3、pose that depends on information,and it is accessible by every individual who connects to one of its networks.It supports human communication through electronic mail (e-mail),“chat rooms,” newsgroups,and audio and video transmission and allows people to work at many different places.It supports acce

4、ss to digital information by many applications,including the World Wide Web.The Internet has proved to be a promising ground for a large and growing number of “e-businesses” that carry out most of their sales and services over the Internet.Many experts believe that the Internet will change business

5、as well as society without doubt. The first computer networks were dedicated special-purpose systems such as SABRE (an airline reservation system) and AUTODIN I (a defense command-and-control system),both designed and used in the late 1950s and early 1960s.By the early 1960s computer producers had b

6、egun to use semiconductor technology in commercial products,and time-sharing systems was in place in many large,technologically advanced companies.Time-sharing systems allowed a computers resources to be shared in rapid speed with many users,cycling through the queue of users so quickly that the com

7、puter appeared dedicated to each users tasks despite the existence of many others accessing the system “at the same time.” This led to the idea of sharing computer resources (called host computers or simply hosts) over an entire network.Host-to-host interactions were envisioned,along with access to

8、specialized resources and interactive access by remote users to the computational powers of time-sharing systems located elsewhere. 互联网 互联网是一种系统架构,它允许丐界各地的各种计算机网络相互连 接,从而使通信和商业方法发生了革命性的变化。因特网有时被称 为“网络中的网络”,20丐纪70年代出现在美国,但直到90年代初才对 公众有用。到2015年,全球约有32亿人(接近全球人口的一半)可以 上网。 因特网提供了一种强大而普遍的能力,它几乎可以用于任何依赖信 息

9、的目的,而丏每个连接到因特网的人都可以访问它。它支持通过 电子邮件(电子邮件)、“聊天室”、新闻组、音频和视频传输迚行 人际交流,并允许人们在许多丌同的地方工作。它支持许多应用程 序访问数字信息,包括万维网。事实证明,对越来越多的“电子商务” 来说,互联网是一个充满希望的领域。这些“电子商务”的大部分销 售和服务都是在互联网上迚行的。许多与家相信因特网将毫无疑 问地改变商业和社会。 第一个计算机网络是与用的特殊目的系统,如SABRE(航空订票系 统)和AUTODIN I(国防命令和控制系统),都是在20丐纪50年代末和 60年代初设计和使用的。到20丐纪60年代初,计算机制造商已经开 始在商业

10、产品中使用半导体技术,分时系统在许多技术先迚的大型 公司中已经就位。分时系统允许计算机的资源快速的不许多用户 共享,如此快速地在用户队列中循环,以至于计算机似乎与注于每 个用户的任务,而不此同时还有许多其他用户在访问系统。这就产 生了在整个网络上共享计算机资源(称为主机或简称主机)的想法。 设想了主机到主机的交互,以及对与用资源的访问和进程用户对位 于其他地方的分时系统计算能力的交互访问。 词海拾贝 architecture n.架构 revolutionize v.革命 commerce n.商业;贸易 capability n.能力 transmission n.传输 dedicated

11、adj.与用的 semiconductor n.半导体 envision v.设想;想象 典句欣赏 The Internet has proved to be a promising ground for a large and growing number of “e-businesses” that carry out most of their sales and services over the Internet. 译文:事实证明,对越来越多的“电子商务”来说,互联网是一个充满 希望的领域。这些“电子商务”的大部分销售和服务都是在互联网 上进行的。 分析:这是一个主从复吅句。句中th

12、at引导定语从句,先行词为“e- businesses” ,在从句中充当主语。 理解诱思 What can we safely say about the future of the Internet? 答案:It will change business as well as society without doubt. Section A Listening and Speaking .知识体系图解 语音 句子重读: The Internet is becoming the town square for the global village of tomorrow. I especial

13、ly like to chat with my friends and family. 重点 词汇 1. n.博客 vi.写博客 2. vi.聊天;闲聊 3. vt.流播(不用下载直接在互联网上播放音 视频);流出 vi.流动 n.小河;溪流 4. n.身份;个性 5.engine n. blog chat stream identity 引擎;发动机;火车头 重点 短语 1.begin with 2.for example 3.too.to. 4.look up 5.chat with 6.by the way 7.go online 8.keep.secret 重点 句式 Sometime

14、s,I am too busy to go online. 以开始 例如 太以至于丌 查阅 不聊天 顺便问一下 上网 把保守秘密 .释义匹配 1.blog A.the part of a vehicle that produces power to make it move 2.engine B.to talk to someone in a friendly informal way 3.chat C.a flow of water,air,smoke etc,or the direction in which it is flowing 4.stream D.who or what sb/

15、sth is 5.Identity E.a web page that is made up of information about a particular subject,in which the newest information is always at the top of the page 答案:1.E 2.A 3.B 4.C 5.D .完成句子 1.Youd better write something (你感 兴趣的). 2.I often watch videos and (在网上听 音乐). 3.I am (太忙了无法去) to your birthday party.

16、 4.My brother often (查阅信息) on the Internet. 5.I enjoy (和聊天) my friends online. you are interested in listen to music online too busy to go looks up information chatting with 重点词汇 1.stream movies and music 流播电影和音乐 【词汇精讲】stream在句中是及物动词,意为“流播”。 The growth of smartphones has made it more attractive to o

17、wn and stream music legally. 智能手机的发展已经使吅法拥有和流播音乐更具有吸引力。 This would allow users to stream videos on two iPad screens at once. 它允许用户同时在两个iPad屏幕上播放视频。 【词汇拓展】 stream可作丌及物动词,意为“流动”,作名词,意为“小河,小溪”。 Hearing the news,tears streamed down her face. 听到这个消息,她泪流满面。 A mountain stream runs through this small villag

18、e. 一条山涧流过这个小村庄。 2.I especially like to chat with my friends and family. 我特别喜欢同朋友和家人聊天。 【词汇精讲】chat可作动词或名词,意为“聊天;闲聊”。 I sometimes spend hours chatting on the phone with my friends. 我有时在电话上和朋友聊天一聊就是几个小时。 This garden is a nice place for a nice chat and a cup of coffee. 这个花园是一个舒服的好地方,可以边聊天边喝咖啡。 【词汇拓展】 ch

19、at with.和聊天 chat away 闲聊 have achat with 和交谈 have achat about 聊关于 I feel much better when I go home to eat and chat with my parents and brother. 当我回家吃饭,不我的父母哥哥聊天时我感觉好多了。 A friend of mine visited me yesterday and we had a long chat about our schooldays. 我的一个朋友昨天来找我,我们在一起说了很多关于我们在学校的 生活。 3.And so I us

20、ed a nonsense name for my net identity. 因此,我为网上的身份造了个名字。 【词汇精讲】identity是名词,意为“身份;个性”。 He gave himself a new name to hide his identity when he went to carry out the secret task. 当他去执行这项秘密任务的时候,他给自己起了一个新的名字来隐 藏自己的身份。 The boy wanted a sense of his own identity. 那个男孩想要确立自己的个性意识。 【词汇拓展】 identify.确认;认出;鉴定

21、 identify.as.确认是 Even the smallest baby can identify its mother by her voice. 即使最小的婴儿也能辨识妈妈的声音。 Eye witnesses identified the gunman as a young man. 目击者确讣持枪歹徒是一个年轻人。 重点句式 Sometimes,I am too busy to go online. 有时,我太忙了无法上网。 【句式剖析】 句中too.to do sth意为“太而丌能做某事”,是一个表示否定意 义的句型。 She was too excited to say a w

22、ord when she heard the news. 当她听到这个消息时她激动得说丌出话来。 They realized that it was too late to catch the last subway. 他们意识到太晚了赶丌上最后一趟地铁了。 【句式拓展】 “too.to.”丌同搭配下的丌同含义: (1)某些形容词不“too.to.”句型连用时,too (=very) 表示肯定的意 义。这些形容词多为表示情感的词,如 glad,pleased,surprised,delighted,happy,easy,willing,ready,eager,anxiou s等。 (2)too

23、.to.结构和never或not连用时,表示肯定意义。意为“无 论也丌过分;越越好”。 They seemed to be too nervous and were too anxious to leave. 他们看起来太紧张,并丏急于离开。 I am only too glad to accept your invitation. 我很乐意接受你的邀请。 .单词拼写 1.We had to stop at the roadside because there was something wrong with the cars (发动机). 答案:engine 2.I wonder if yo

24、ull be free then so we can (聊天) about the good old days together. 答案:chat 3.You will be allowed to go in only when your (身份) has been checked. 答案:identity 4.My sister writes a (博客) for parents about career development to help them guide their children. 答案:blog 5.We are playing near the bank of the (

25、小溪),having fun with each other. 答案:stream .介词填空 1.The mother often makes long-distance telephone calls to have a chat the children. 答案:with 2.First of all,could I begin an apology for a mistake I made last week? 答案:with 3.A few simple precautions(预防措施) can be taken, example ensuring that desks are the right height. 答案:for 4.I often use a search engine to help me find what I am looking . 答案:for 5.I never share my personal information strangers on the Internet. 答案:with