Unit 3《 The World Online》-Welcome to the unit課件1（16張PPT） （牛津譯林版選修7）

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The World Online,The World Online,Welcome To The Unit,Do you know how people keep in touch with each other in the past?,,,,Writing letters,Using Postcards,Fax,By telephone,But what about now?,People usually go to the net to talk with each other.,Which programme would you like to watch tonight? I hate to clean windows. The music from the keyboard sounds like music from a real piano. Memory is something you may start to lose with age. Julie wants to have a pet mouse.,What can we do with the internet?,Search for information.,Receive e-mail.,Shop on line.,Talk with friends,What do we call this kind of website that provides searching services?,We call it search engine.,What search engines do you know?,Baidu,Have you ever done some shopping on line?,How to shop on line?,What are the advantages and disvantagesof online shopping?,As online shopkeepers do not have to pay for the rental of a real shop, the products sold online are usually cheaper than those in real shops. It’s easy and convenient to compare a product in several online shops. Paying for things is simple as you just key in the credit card number and confirm the payment online. The delivery is usually quick and the online shops provide delivery to your home. The most important thing is that shopping online saves a lot of time.,Because people can see only pictures of the products online, sometimes you could receive something that was not what you really wanted. The safety of the payment online is not 100% guaranteed as someone may steal the account numbers or pin numbers of your credit cards registered online. Also , someone falsely advertise products and then steal customers’ money.,,Have you ever tried talking online?,What are needed if you want online talking?,a computer connected to the internet,a web-camera,a web-microphone,web talking software,What are the good points and bad points of online talking?,POSITIVE :,save time,save money,keep in touch with people everywhere at any time,make friends from all over the world,NEGATIVE :,pictures and voice not steady,your pictures may be used by some bad people,同學們,來學校和回家的路上要注意安全,同學們,來學校和回家的路上要注意安全,