试题题干
American music in the first half of the 20th century was famous for（） introduced by African-Americans in the south.
参考答案
正确答案：
试题解析
The first half of the century is famous for jazz, introduced by African-Americans in the south. 上世纪上半叶以爵士乐而闻名，由美国南部的非裔美国人引进的。