根据对话内容选择最佳答案。
It's Sunday. All the children of Class 1 are going on a trip. The children are very excited. They will go to the zoo.
Mr. Black: Look! The elephants!
John: Wow! Look at the tallest one. It's much stronger and bigger than others. And its
legs are longer.
Wu Binbin: Yes. I think it's older, too.
Amy: Look at the monkeys. They are funnier.
Sarah: You're right. Oh, there is a little monkey under the tree. It's not happy,is it? Why?
Amy: Maybe it is hungry.
Sarah: Let's give some food to it.
Amy: Look at the sign and it says, "Don't feed animals!”
Sarah: I know. Let's go there.