外研社计算机专业英语unit-one.pptVIP

* Unit One A Friend or a Spy–Computer Learning objectives In this unit you should get familiar with: the functions of computer the changes computer brings to our life the advantage of computer the disadvantages of computer Return to Home I. Warm-up 1.Look at the following figures and label them correctly with the words given below. Notebook computer Desktop computer Scanner Mainframe computer Laser Printer Handheld PDA Figure 1.___________ Figure 2.___________ Figure 3.___________ Figure 4.___________ Figure 5.___________ Figure 6.___________ Return to Home II. Part A Personal Computer are Changing the World Personal computer have been changing our daily life since IBM launched its pioneering PC on August 12, 1981. From then on, people have sent instant messages while watching friends on web cameras rather than inking letters to faraway friends. And people also could search online for anything from love to medical advice or bargain airfares. Personal computer gives the world telecommuting，video games and sedentary lifestyles． Although it has made a stunning difference in people’s lives，personal computer is still in the early stages of this stuff． When wireless seems to be everywhere, our life will be a big leap that is the things people couldn’t dream of． Computer has already changed our life in many ways. The unprecedented access to people and information provided by computers has changed society’s privacy landscape. Credit cards, banks and telephone companies record user activities．Internet firms that provide free services such as on-line searches，maps，and e-mail save information typed in by users and sort it by unique identification numbers in the machines. With so much of our lives digital，the ability of the government and other people to know what we are doing, reconstruct our lives and basically stalk us online has grown. Now, as far