Unit9 when was it invented,A: Do you have a computer now? B: Yes, I have. A: Did people have a computer 40 years ago? B: I think they hadnt,A: I think the telephone was invented before the car. B: Well, I think the telephone was invented after the car,invent 发明，创造 sweet 甜的 salty 咸的 crispy 脆的 sour 酸的 potato 土豆 chip 片 mistake 错误 by mistake 错误地 thin 薄的，细的,Words,in the end 最后，终于 chef 厨师 sprinkle 撒（粉末状物）；洒（液体） abacus 算盘 century 世纪 telescope 望远镜 camera 照相机,Words,A: When was the telephone invented? B:
