2019-2020学年度人教版必修五 Unit 3 Life in the FuturePeriod1Warming up课件(14张)
2019-2020学年度人教版必修五 Unit 3 Life in the FuturePeriod1Warming up课件(14张)第3页

Transportation

Compared with the past, what is the most important thing in future transportation?  Why will the maglev train be popular in the future?

No pollution is the most important thing.