2018-2019学年度人教版必修二Unit 3 Computers-reading 课件(共23张PPT)
2018-2019学年度人教版必修二Unit 3 Computers-reading 课件(共23张PPT)第3页

 Look at these inventions. Can you put them in an order according to the time when they appeared? After reading the passage, check to see if you were right.

( ) analytical machine ( ) laptop ( ) calculating machine ( ) robot ( ) PC ( ) universal machine