2019-2020学年度人教版必修二Unit3ComputersPeriod1Warming up课件（29张）-302edu教育资源网

2019-2020学年度人教版必修二Unit3ComputersPeriod1Warming up课件（29张）

An abacus is an ancient tool used for counting. The abacus has been in existence in China since the second century BC until now, although the oldest counting boards have been found in fourth century BC Rome.

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