2016-2017学年 人教版 必修三 Unit 4 Astronomy :the science of the stars using language课件(15张)
2016-2017学年 人教版 必修三  Unit 4 Astronomy :the science of the stars using  language课件(15张)第2页

Which one is better? Why?

Homework: Write a short article explaining one of the problem that you might have on the moon. Set out what you should do to overcome this difficulty and have a happy visit.