21. Passed from father to son, the music has not changed for eight centuries，and among the richer Naxi people, ________ knowledge of this music showed that you were ________real gentleman.
A. a; a B. the, 不填 C.不填;a D. the; the
22. We should educate children and young people about values to create a social atmosphere ______ promotes morality and harmony.
A. who B. what C. where D. that
