Nations usually specialize in industries where they have a comparative advantage.
"The house is a closet" is a metaphor. It means that the house is small, like a closet.
Answer:
The French army stayed behind in Egypt—and so did the scholars. In late August, shortly after Napoleon's departure, a large, heavy package arrived at the scholars' palace in Cairo. When they opened it, they found it contained a black stone slab covered with writing in three different scripts.