从方框中选择正确的句子补全对话。

A. What is the baby monkey doing? B. I am looking at the monkeys. C. Let's go to see the elephants. D. They are going to drink water. E. It's singing.

Alice and Bill are in the zoo now.

Alice: What are you doing now?

Bill: They are lovely.

Alice: Yes.

Bill: It is eating a banana. The mother monkey is cleaning their house.

Alice: Look! There is a bird in the tree.

Bill: Oh, it's beautiful!

Alice: Great! Look! What are the elephants going to do?

Bill: I think they are thirsty(口渴的).

Alice: That's right.