The quote is from the perspective of 'a woman from Beijing', it's not meant to be an exhaustive list, just as this article is not meant to be a research study -

The quote is from the perspective of 'a woman from Beijing', it's not meant to be an exhaustive list, just as this article is not meant to be a research study - it's a perspective piece. Interestingly enough, it implies that women from Beijing (or at the very least this one) are under the impression that those are the only three jobs available to Chinese immigrants. Of course there are more possible jobs available, but I find the anecdotal perspective more valuable in this journalistic context.