听力原文: "What do you think is really important in the United States? I really think that
15. Why do American young people usually leave their families at eighteen or nineteen?A. Their working place is too far away from their families.
What does the passage mainly discuss?
A.The speaker's opinion about American society.
B.The relationship between American parents and their children.
C.American young people's independence.
D.American social values.