问题：
[不定项选择题] “Popular art” has a number of meanings, impossible to define with any precision, which range from folklore to junk. The poles are clear enough, but the middle tends to blur. The Hollywood Western of t
A、limit the extent to which singers influenced the musical compositions and performance of his operas
B、use his operas primarily as forums to protest both the moral corruption and dogmatic rigidity of the political leaders of his time
C、portray psychologically complex characters shaped by the political environment surrounding them
D、incorporate elements of folklore into both the music and plots of his operas
参考答案：
A、limit the extent to which singers influenced the musical compositions and performance of his operas
● 参考解析
