“What about you?”之中的“about”是什么词性?

“What about you?”之中的“about”是什么词性? what about you 中文 what about you like? what about you What about you? what about you 汉语 What about you? so what about you? what about you? what about you what's about you? 用括号中的词提问下面句子They tell you what a picture is about.(what) what are you talking about what are you talking about Reading books.what about you? What are you talking about About what colour do you i care about what you what do you think about