图文搭配，选择合适的句子序号填入括号内。

A . There is an animal school in the forest. Mr. Owl is a teacher in this school. There are no classrooms in the school. All the pupils have their classes in the forest.

B . Rabbit stands by the river. His classmates Duck and Dog swim in the river. Rabbit can't swim. He is sad.

C . Rabbit stands under the tree. Monkey and Cat play on the tree happily. Rabbit can't climb the tree. He is very sad.

D . "Come on, Rabbit! You can run. Let's run!" Mr. Owl says. Rabbit can run. She runs faster than her classmates. She's the first. She's happy.