A. Is this your twin sister? B. Who is she?
C. He is my brother. D. This is my family picture.
Mother Duck has four babies— three small yellow ducklings (小鸭) and one big and ugly(丑陋的) duckling.
The three yellow ducklings play together. They are happy. The ugly duckling is sad. He swims away.
In winter, the ugly duckling feels cold. But he has no home.
It is spring now. The ugly duckling looks into the water. He is a beautiful swan! He is happy.