Unit 4 Amazing Science Welcome to the unit Topic 2 When was it invented? Section B New words bulb 电灯泡电灯泡 clone 克隆克隆 experiment 实验实验 benefit 使受益，对使受益，对 有用有用 organ 器官，器官， AIDS 艾滋病艾滋病 laptop 便携式电脑便携式电脑 1a Listen, read and say digital camera Look and read light bulb mobile phone 1.Who invented it? Edison. 2.When was it invented? In 1879. Look, listen and answer 3.How many inventions did he invent during his life? About more than 1000 inventions. 1. Whats this? A radio. 2.Who was it invented by? Gug
