Unit 9 When was it invented? Section A Period 2 Four great inventions in ancient China: Paper-making(造纸术） Compass（指南针） Printing（印刷术） Gunpowder（火药 ) 【最新】九年级英语 Section A 2 课件 人教新目标版 课件 A: When was the telephone invented?B: It was invented in 1876. A: Who was the telephone invented by? B: It was invented by Alexander Bell. A: What is it used for? B: It is used for talking on the phone telephone in 1876 Alexander Bell 【最新】九年级英语 Section A 2 课件 人教新目标版 课件 computer in 1976 A: When was the computer inven
