公开课课件unit3 computers.ppt

I am very old now. I was born in ancient China. Many people used me for calculating in the past, but now I am a bit lonely because they don’t like me now. Do you know who I am? I am very small. I can be used for calculating. In China, a lot of students use me when solving mathematical problems. Do you know who I am? If you have a computer,what would like to do most? I can do… with a computer The development of computers The passage on page 18 will you more Topic sentences Thank You! What are the advantages and disadvantages of the computers? Discussion The advantage/ disadvantage is … I think /don’t think that… I think…because of … Let’s decide… As/ Since…, I think … I agree /don’t agree…because… First… Second… I believe that… I’ve decided that… Read the passage again. Underline the sentences that you do not understand and try to solve the problems using context clues and the dictionary. V. Homework * * L/O/G/O Riddles (谜语) abacus calculator I am very big. Scientists use me to solve some mathematical problems. huge computer Do you know who I am? PC Personal Computer I’m a small, relatively inexpensive computer designed for an individual user. At home, people use me to surf the Internet and play games. Do you know who I am? I can be used for calculating. Besides, I can also be used for watching DVD, sending e-mail and communicating through the Internet. However, I am not a PC, because I’m small enough for you to take me with you. Do you know who I am? laptop PDA Personal Digital Assistant I am so small in size that I can fit in your hand. I usually have a small screen usually bigger than a digital phone, however smaller than the smallest laptop, I’m a great way to store telephone numbers, access the internet, make calculations, and so on. Do you know who I am? robot I’m a machine that works automatically. I can do a wide variety of tasks, especially suitable for doing jobs too boring, difficult, or dangerous for human beings. Do you know who I a