Unit 6 When was it invented? 知识点题库

— There are about four         .

—No, he      silent all the time.

    The Internet joins millions of computers all over the world,and today it is used by people all over the world.It was invented in the 1960s in the USA.The American government needed a network of computers for its army.Then in the 1970s scientists and business people also wanted to use the Internet to send and receive messages.For some years,they weren't allowed to use the US network,and when they were allowed to,the messages were in very simple text without photos.

    The World Wide Web was invented by a British scientist named Tim Berners-Lee in 1989.He wanted to send documents to other scientists,so he developed the World Wide Web.This allowed him to send and receive scientific documents with text,drawings and photos(also called multimedia documents).In the 1990s,more and more people began to use the Internet and the World Wide Web.

    So what's the difference between the Internet and the World Wide Web?The Internet is the hardware.It allows us to communicate with other people.The World Wide Web is the software.It allows us to create, see and read multimedia documents.

    The Web is made up of millions of documents called Web pages.These pages are held in computers all over the world.Many people have a favorite website with a number of Web pages on the same subject.

    The email is a way of using your computer to send and receive messages.It's cheaper and quicker to use emails than send normal mails.New users call the normal mail “snail mail” because it's too slow.It took 50 years for 100 million people to listen to the radio.It took 15 years for 100 million people to watch television.By the year 2000, it had taken only about three years for 100 million people to use the Internet.What will happen next on the Internet?

    I'm sure you look into the mirror several times a day. In fact, we can't live without mirrors. Today mirrors are everywhere A from your room to your father's car. They are helpful in many ways. The mirror has a long history. But do you know who invented it and when it was invented?

    People started using mirrors a long time ago. The first mirrors used were natural mirrors such as reflection in water. The first man-made mirrors were made out of the rock. Later, people used different metals such as bronze（青铜） to make mirrors. Throughout history, different types of mirrors have been used in many different cultures at the same time.

    The first glass mirror was invented by a German named Justus Von Liebig in 1835.He used a silvering（镀银） technique to produce the glass mirror. Today aluminum is the main metal used for mirror.

    Today, mirrors come in various shapes and sizes. They are used for different reasons. We usually start our days by looking into the mirror in the bathroom. We also use them often during the day to keep ourselves tidy.

    Mirrors are important for cars too. If cars don't have mirrors, it's impossible to drive. This is because drivers can't see other cars coming. Of course, that would lead to many car accidents. It is said that breaking a mirror causes seven years of bad luck. So, look after your mirrors well.

    Many people thought a computer wasn't supposed to be able to beat a top master at the ancient Chinese game, Weiqi, for at least another 10 years. But AlphaGo, an artificially intelligent system (人工智能系统) designed by Google, made it. It easily beat Lee Sedol last year, one of the best players in the world. It challenged the world's top players to show how much progress it had made over the past few years.

    In late May, 2017, AlphaGo appeared in China and played against 19-year-old Ke Jie in Wuzhen, China. He is No. 1 player now in the world. However, the result wasn't out of people's expectation. He lost the match. Though Ke Jie tried his best and he once saw the victory just a step away, he lost his best chance when he became excited.

    At the press conference (新闻发布会) after the match, Ke Jie was interviewed by the reporters. He said he had realized how powerful AlphaGo was, and it was getting perfect. When a Chinese reporter asked him in English, the reporter spoke so fast that the interpreter (口译员) couldn't catch him. Ke Jie got kind of angry and told him that it was unnecessary for two Chinese to speak in English. The reporter apologized to him and offered to ask him for a coffee.

    The cat and mouse game is over, but the challenge between man and robots will still go on.

He said that potato chips by all kids.

He a famous violinist one day.

When the car ?