Unit 3 A healthy life 单元导学课件（189张）

Unit 3　Inventors and inventions Period One　Warming Up & Reading Period Two　Learning about Language & Using Language Period Three　Grammar Period Four　Writing ? 单元总结提升 　　网络的发明给人们的生活带来了极大的便利，可它的发明过程却是极其复杂的，很多科学家为网络的发明做出了巨大的贡献。 单元话题导入 　　The Internet is something that many of us now take for granted, but the invention of the Internet is still recent. The Internet is essentially a network connecting thousands of smaller networks into a single global network. The Internet model and the Transmission Control Protocol(传输控制协议) used to implement the idea were developed in 1973 by Vinton Cerf, an American computer scientist. His project was backed by the United States Department of Defence Advanced Research Projects Agency (ARPA)，directed by Robert Khan, an American engineer. The Internet initially was used to connect university networks and research 单元话题导入 labs within the United States. The World Wide Web, as we now know, was developed in 1989 by Tim Berners?Lee, an English scientist, for the European Organization for Nuclear Research(CERN). The design of the Internet was done in 1973 and published in 1974. There ensued about 10 years of hard work, resulting in the roll out of Internet in 1983. 　　The Internet Protocol is a key element (要素) to a successful Internet. The Internet Protocol determines how a gateway receives a request and what to do with that request once received. The Internet has changed 单元话题导入 our world by bringing a wealth of information to our fingertips. The sharing of information has accelerated with the introduction of the Internet, with new, fresh content accessible per second. More applications are being introduced to the Internet, and with the rising popularity of Internet?enabled phones, the Internet will only continue to grow at a tremendous(巨大的) rate opening up thousands more opportunities to all of us. The invention of the Internet is indeed one of the most recent revolutionary inventions which have been a major success and welcome addition to our world. 单元话题导入 Task: Answer the following questions. 1. What is the Internet? _____ _____ 2. What was the Internet initially used to do? _____ 单元话题导入 The Internet is essentially a network connecting thousands of smaller networks into a single global network. The Internet initially was used to connect university networks and research labs within the United States. 3. When was the design of the Internet done and published? _____ 4. What does the Internet Protocol determine? _____ 单元话题导入 The design of the Internet was done in 1973 and published in 1974. The Internet Protocol determines how a gateway receives a request and what to do with that request once received. Knowledge and skills 1．Understand the usage of the words, expressions and sentences： (1)Key words and phrases： distinguish　vi. & vt.　显示……的差别；使……有所不同；辨别 merciful　adj. 宽大的；仁慈的；慈悲的 ... ...