answer: #Person1# and his mother discuss the water ballet performance they're watching. His mother tells #Person1# a lot about water ballet and #Person1# admires her erudition.
documents: #Person1#: Look! Mom, that's amazing! I can't believe the girls have so neat movements.
  #Person2#: Yeah, they all received very strict training. A minute on the stage takes ten-year practice.
  #Person1#: And all their movements are so elegant. It seems like dancing in the water.
  #Person2#: Exactly, you know, water ballet puts dancing, music and swimming together.
  #Person1#: There you go! Daddy has told me that water ballet is also called Synchronized Swimming.
  #Person2#: That's my boy! Katherine Curtis created this activity in 1920. And in 1984, it was authorized as one activity in Olympic Games.
  #Person1#: Wow, Mom is more knowledgeable than Dad. I must learn from you.
  #Person2#: My little boy, you should learn more from me. I'm almost thirty years older than you.
  #Person1#: OK, you're the boss. Look, Mom, one guy has just jumped into the swimming pool.
  #Person2#: Oh, my God. It's so dangerous. And he might break his leg. You mustn't do anything like that.