If the answer to the second question is that they have never eaten hamburger or pizza, or that eating such things makes them sick, then eight or nine out of ten of these must have someone cooking for them at home.
帶便當的就不用說了；如果回答說從來不吃漢堡、披薩，或者說吃了覺得要吐出來，八九不離十都是有家室者。