Hong Kang is an s_____ of China

Hong Kang is an s_____ of China
Hong Kang is an s_____ of China

Hong Kang is an s_____ of China
section
我有一个疑问,为什么s开头的词 前面要用an
是不是题目写错了啊?

segment
？

SAR 特别行政区
S大写