重大版必修5 Unit 5 History and People warm up（共21张PPT）

课件21张PPT。post horsepigeontelegramtelephoneInternetmobile phonegesturefireLook at the pictures of different means of communication.Which means were used in ancient times and are seldom used now?post horsepigeonfireWhich means are the most popular nowadays?Internetmobile phoneHave comments on different means of communication. What are their advantages or disadvantages?fast reliable accurate safe advanced provide sound / written information modern / ancient Do you know anything about the history of the Internet?Invention of the Internet The Internet was not an idea of an individual, but a visionary thought in the minds of many geniuses. The first person who initiated this idea of mass amalgamation of knowledge was Leonard Kleinrock. J.C.R. Licklinder was appointed the head of the new IPTO (Information Processing Technology Office) organization in 1962. Lawrence Roberts lead a team that created the ARPANET (Advanced Research Projects Agency Network), in 1967. The major contribution to the Internet today was by Tim Berners-Lee in 1990, by developing the HTML. Soon, he introduced the World Wide Web to the public on August 6, 1991. By 1993, Internet faced a major boom and has become accessible anywhere at anytime by anyone today. Let’s watch a clip about the Internet. Then talk about the advantage and disadvantage of the Internet in pairs.Advantages1. Communication: Now we can communicate in a fraction of second with a person who is sitting in the other part of the world. Today for better communication, we can avail the facilities of e-mail; we can chat for hours with our loved ones. 2. InformationThe search engines like Google, yahoo is at your service on the Internet. You can almost find any type of data on almost any kind of subject that you are looking for. Today, it is almost required that students should use the Internet for research for the purpose of gathering resources. Teachers have started giving assignments that require research on the Internet. 3. EntertainmentDownloading games, visiting chat rooms or just surfing the Web are some of the uses people have discovered. There are numerous games that may be downloaded from the Internet for free. The industry of online gaming has tasted dramatic and phenomenal attention by game lovers. Chat rooms are popular because users can meet new and interesting people. 4. Services
Many services are now provided on the internet such as online banking, job seeking, purchasing tickets for your favorite movies, guidance services on array of topics engulfing the every aspect of life, and hotel reservations. Disadvantages1. Theft of Personal informationIf you use the Internet, you may be facing grave danger as your personal information such as name, address, credit card number etc. can be accessed by other culprits to make your problems worse.2. Spamming:
Spamming refers to sending unwanted e-mails in bulk, which provide no purpose and needlessly obstruct the entire system. 3. Virus threatVirus is nothing but a program which disrupts the normal functioning of your computer systems. 4. Pornography
This is perhaps the biggest threat related to your children’s healthy mental life. There are thousands of pornographic sites on the Internet that can be easily found and can be a detrimental factor to letting children use the Internet.ReviewKeep the words in mind:
latter latest individual
develop service convenientHomeworkWrite a short passage to talk about the advantage and disadvantage of the Internet.（120字左右）
参考词汇：
latter latest individual
develop service convenientPreviewLearn the words on P118 by heart.
Read the text and underline the sentences you don’t understand.Thanks!