After reading this unit and completing the exercises，you will be able to

☆ understand the earliest calculating devices，such as abacus，Napier’s Bones and so on；

☆ be familiar with the history of computer development；

☆ identify all the general elements of a computer structure；

☆ apply your knowledge when using your computers. eiuLb2c9sGSaD6Pl5Tt3MvR0HMAdww9yeKwAPIA1SKNOw4EACFyA59UHYi+BJd1C