Passed from father to son, the music has not changed for eight centuries，and among the ric

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

A. a; aB. the, 不填(答案→)C. 不填;aD. the; the解析：考查冠词题。这种音乐知识是很广泛的，所以是泛指，而knowledge又是不可数名词，故不填；a real gentleman一个真正地绅士。

我也是这个答案