Hi, Michael! It's a nice day, isn't it?
Yes,it is. What are you going to do today?
Mm, there are some old city walls near Beijing railway Station. Let't go and have a look, shall we?
That would be great!
(An hour later, they arrive there.)
Look! These are old city walls. They are more than 500 years old.
There are still many old city walls in Beijing, aren't there?
No, there aren't. Only a few of them remain now.
Oh,you know a lot about them, don't you?
Yes.I'll tell you more later.