问题
单项选择题
The cosmopolitan flavor of San Francisco is enhanced by ______ shops and restaurants.
A．an ethnic
B．its many ethnic
C．its ethnicity
D．ethnicity
答案
参考答案：B
解析：[分析] 结构识别 所填之词是用来修饰shops and restaurants的，选项A是单数不合适；选项C，D都是名词；因此B为答案。