Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.

Which element of the following can contribute to work stress according to the passage

A．Good family atmosphere gives kids an advantage in school study.
B．"Family gap" applies to students of all backgrounds.
C．Parents’ education background has little impact on the children’s score.
D．There is a racial and gender difference on the children’s score.

A．The dancers are not only confined to native American Indians.
B．It’s hard to tell the origin of the music, dances and some costumes.
C．Even within the same tribe no universal style or complete agreement exists.
D．The won-us-award dance was originally used to retell battles.