2019-2020学年度人教版必修二 Unit3 Computers Period 1 Warming up 课件(29张)
2019-2020学年度人教版必修二 Unit3 Computers Period 1 Warming up 课件(29张)第3页

 I am very old now. I was born in China. Many people used me for calculating in the past, but now I am a bit lonely because they don’t like me now. Do you know who I am?

abacus

Riddles(谜语):