2018-2019学年度人教版选修二Unit 3 Computers-Reading课件 (共43张PPT)
2018-2019学年度人教版选修二Unit 3 Computers-Reading课件 (共43张PPT)第3页

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

abacus ['æbəkəs]

Guess :