answer: #Person1# asks #Person2# about the Tree-planting Day. #Person1# is confused because #Person2# says planting trees and cutting down trees both make our life better.
documents: #Person1#: What are you doing, Mum?
  #Person2#: I'm getting something ready for tomorrow. Tomorrow is Tre e-planting Day.
  #Person1#: Tree-planting Day? What do people do on this day, Mum?
  #Person2#: Many, many people will go and plant trees.
  #Person1#: Why do they do tha t?
  #Person2#: To make the earth more beautiful. And to make our life better.
  #Person1#: But I often see people on TV cut down many big trees. Why do they do that, Mum?
  #Person2#: Hm, to make paper, houses, and to make our life better.
  #Person1#: To make our life better, too? I just don't understand. Mum, why do many people go and plant trees on the same day?
  #Person2#: Oh, my dear son. It's hard to explain to you. When you grow up, you will understand. Just remember trees are very important to us.