Unit 3 Unit 3 Inventors and inventionsInventors and inventionsWarmingup&ListeningUnit 3 Unit 3 Inventors and inventionsInventors and inventionsWarmingup&ListeningWhen we speak of inventions, we When we speak of inventions, we cant help thinking of cant help thinking of the four the four great inventionsgreat inventions in ancient China. in ancient China. Can you name them?Can you name them?Warming uppaper-making printingcompassgunpowderHow many famous inventors do you know? What did they invent?