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课件网) Unit 4 Amazing Science Topic 3 China is the third nation that sent a person into space. Section C 1. Some words: doubt, tiny, inside, brain,cancel, connect 2. Some phrases: no doubt, for instance 3. Some sentences: (1) There is no doubt that computers are very useful in technology and business (2) Computers help us at work and at home, but they must be used properly. What are the computers used for Computers were invented in the USA in the 1950s, now they have become very important in many areas of work and leisure. Doctors can find diseases easily with the help of computers. For example, tiny computers which are inside patients' bodies can keep their hearts beating normally. In space, computers have been used to control the speed and direction of a spaceship. 1a Read and understand. 1. Tick the fields we use the computer in. education business industry communication daily life medical care entertainment sports 1a Read and understand. 2. Can you give an example of the use of the computer in one of the fields above The Importance of Computers Since computers were invented in the USA in the 1950s, they have become very important in many areas of work and leisure.There is no doubt that computers are very useful in technology and business. In space, computers have been used to control the speed and direction of a spaceship.With the help of computers, doctors can find diseases easily and solve other problems.For example, tiny computers which are inside patients' bodies can keep their hearts beating normally. In factories, robots are controlled by computers that are like human brains. They can do work that is dangerous to humans. In business, computers are used to place and cancel orders. They are also making the workplace safer and better. Since the Internet came into being, people's lives at home have changed, too. More and more people have personal computers that are used to play games and watch movies. Thanks to the Internet, people can do shopping and do business at home. Instead of writing letters on paper, people communicate by sending e-mails and chatting on line. The whole world is connected. The Internet is making the world smaller, like a village. Computers have improved our lives, but they have brought problems, too. For instance, if we work on computers too long, we may get headaches or sore eyes. If we play computer games too much, we won't have enough time to study or exercise. Besides, not everything we read on the Internet is true or good for puters help us at work and at home, but they must be used properly. There is no doubt that we will be successful. I don't doubt that they will be able to solve the problems. doubt n. & v. 怀疑，疑惑 (2)doubt (vt.)+ 从句 (3)doubt (vi.)+ about / of Doubt is the key to knowledge. There is no reason to doubt of his honesty. I doubt whether/if he'll change his mind. (1)doubt (n.) 1.There is no doubt that computers are very useful in techn ... ...
