人教版高中英语必修2第三单元Reading（(共18张PPT).ppt

technological revolution analytical machine working with a computer Main idea ? (Pictures + title) Possible answers: A brief introduction about the development of the computer. The computer plays an important part in people’s life. How does an analytical machine become a computer? What’s the main idea of this passage? An exposition Find the topic sentence of each paragraph These changes only become possible as my memory improved. Many new applications have been found for me. Over time I have been changed quite a lot. From calculating machines to personal computers and laptops From tubes to chips Computers are helpers of the human race. An introduction about the development and the new applications of the computer. General ? Detailed Time I n 1642 200 years later about thirty years later Changes of name Changes of function Time since the 1970s since 1936 Changes of name Changes of function began as a calculating machine Simplify difficult sums was built as an analytical machine analyze numbers think logically In 1642 Two hundred years later was programmed by an operator About thirty years later be made to work as a universal machine solve difficult mathematical problem be made as a PC laptop be used in offices and homes since the 1970s since 1936 In 1642 Two hundred years later About 30 years later Simplify difficult sums analyze numbers think logically began as a calculating machine was built as an analytical machine since the 1970s since 1936 solve difficult mathematical problem be used in offices and homes be made as a universal machine be made as a PC laptop was programmed by an operator How is the first paragraph organized? In the order of time. What makes the computer become smaller and smaller? How can people share information with others? memory tubes transistors chips What are the new applications of the computer? computer Communication Finance and Trade space rockets robots medical oper