根据短文内容的理解，选择正确答案。
A
TheSoundofMusic is one of the most popular American movies. And the song DoReMi in the movie is also popular in the world.
The movie tells a story about a tutor, Maria. She is a young and outgoing woman. She goes to look after a family with seven children. Their family name is Von Trapp. Mr. Von Trapp is a captain. He and his family live in Austria.
The family are very sad after the children's mother, Mrs. Von Trapp, died. Nobody takes care of the children. They cry and shout every day. The lonely father often becomes angry because of the noisy children.
Maria often teaches them to sing lively songs and perform short, funny plays. At first the father is almost mad, but the children's smiling faces make him happy again. Then Mr. Von Trapp falls in love with Maria. At last they get married.
分别是函
的零点，则