answer: #Person1#'s hosting the program and invites Doctor Green to introduce the forest which has 1500 kinds of plants, 750 kinds of trees, and 400 kinds of birds in about one square kilometer.
documents: #Person1#: So, here we are. Deep in the forest. With me is doctor Mike Green. Doctor Green can you tell us a little about this wonderful place?
  #Person2#: Yes, of course, as you can see, the forest is full of trees, birds and insects.
  #Person1#: Yes, there are some strange and beautiful plants everywhere. How many different kinds of plants are there?
  #Person2#: Well, in just one square kilometer of the forest, you can find about 1500 different kinds of plants, and many of those 1500 kinds of plants don't grow in any other place in the world.
  #Person1#: And there are hundreds of trees too, aren't there?
  #Person2#: Yes, there are. In fact, there are about 750 different kinds of trees in one square kilometer.
  #Person1#: Really? Now, I'm sure the people listening to this program are interested in the living things in the forest.
  #Person2#: Well, the forest is full of living things. For example, you can find about 400 different kinds of birds in just one square kilometer.
  #Person1#: Really? How interesting!