A：Hey,there is a brown bear!
B:Where is it?
A:There,behind the monkey cage.
B:Wow,I see,it's such a big one.
C:I like bear,let's go and have a look.
D:OK,let's go.
C:I heard that brown bear is a kind of the greatest bear in the world.
A:Look at its paw and the fingernails.
C:Yes they use it to attack their prey,and their fingernail is so sharp.
B:Guess if it stroke your face with that fat paw?
A:I'd better not.
D:I think we'd better keep far away from the cage.
C:Yes it's not a good idea to check its terrible prey ability.
A:How do you know so much of animals?
C:I always read books about them,I like animals.
D:So do I.Could you lend me some books?
C:Sure if you like.