高中英语 Unit 3 ComputersSectionⅠ同步教学课件 新人教版必修2.ppt

Section Ⅰ　　Warming Up & Reading－－Preparing预习多维感知预习多维感知 Section Ⅰ预习多多维感知感知►Step One：：Ask and DiscussionLook at the following pictures and then complete the dialogue.1．．—What’s this?—It’s an____________.It is an old calculating machine used in China until now.答案：答案：abacus2．．—What’s this?—It’s a____________.It is a new calculating machine which can solve a large number of mathematical problems.答案：答案：calculator3．．—What’s this?—It’s a__________.It is a personal computer which can solve all kinds of problems and is widely used now.答案：答案：PC4．．—What’s this?—It’s a__________.It is a kind of useful computer which can be taken conveniently like a notebook.答案：答案：laptop•►Step Two：Fast Reading•Scan the text and then choose the best answer according to the text.•1．Who am “I” according to the text?•A．An operator.　　B．A robot.•C．A computer. D．An inventor.•答案：C2．．Why is Alan Turing called the real father of the computer?A．．He invented the computer.B．．He made the computer smaller.C．．He made the computer widely used.D．．He wrote a book about the computer.答案：答案：D3．．Why did the computer completely change its shape?A．．Because it could do many things.B．．Because its memory greatly improved.C．．Because it could simplify sums.D．．Because it never forgot things.答案：答案：B4．．When were the computers connected to one another?A．．In early 1960s.B．．In the 1970s.C．．In the 1940s.D．．In the year of 1936.答案：答案：A5．．What can we learn from the text?A．．The computer will take the place of human beings.B．．The computer will be smarter than human beings.C．．The computer will be a disaster for human beings.D．．The computer will be used in many fields in life.答案：答案：D►Step Three：：Careful ReadingⅠⅠ.Read the text and then answer the following questions.1．．Who was the real father?______________________________________________________________________________________答案：答案：Alan Turing.2．．What has happened to “I” since the 1970s?______________________________________________________________________________________答案：答案：I have been used in offices and homes，，and many applications have been found for me.3．．What’s the main idea of the text?___________________________________________答案：答案：This is a short history of the development of computers.ⅡⅡ.Please find out the topic sentence of each paragraph.Para.1______________________________________Para.2______________________________________Para.3______________________________________答案：答案：Para.1：：Over time I have been changed quite a lot.Para.2：：These changes only became possible as my memory improved.Para.3：：Since the 1970s many new applications have been found for me.►Step Four：：SummaryI began as a 1.____________ machine in 1642.It took nearly two hundred years 2.____________ I was built as an analytical machine.I became a “universal machine” in 1936 to 3.____________ any mathematical problem.I was very big at one time.However，，as time 4.____________，，I was made smaller and smaller.I was given a family 5.____________ by a network in the early 1960s.I was able to 6.____________ my knowledge with others 7.____________ the World Wide Web.I have been widely used in many fields，，such as in communication，， 8.____________，， trade and medical 9.____________.I have also been put into robots and space rockets to 10.____________ the Moon and Mars.I’m glad I am a devoted friend and helper of the human race.答案：答案：1.calculating　　2.before　　3.solve　　4.went by5．．connected　　6.share　　7.through　　8.finance9．．operations　　10.explore►Step Five：：DiscussionWith the development of computer technology，，the Internet had become more and more popular among students.However，，just as a saying goes，，a coin has two sides.The Internet brings both advantages and disadvantages to students.Discuss with your partners to list some advantages and disadvantages of the Internet.Advantages：：____________________________________________________________________________________________________________________________________________________________________________Disadvantages：：____________________________________________________________________________________________________________________________________________________________________________答案：答案：Advantages：：(1)communicate with friends(all over the world)(2)listen to the music(3)see films & watch news(4)play games(5)do shopping(6)save a lot of time(7)do a lot of useful thingsDisadvantages：：(1)Some people especially the teenagers are addicted to the computer games and chatting on the Internet. As a result，，they have little time to study.(2)Some people use the computer wrongly.。