Professor plum is showing the detached style of listening. This type of listener are intellectually not present in a conversation although they are present physically. In the situation described clearly the professor was not listening to what Roberto was saying.
I think it would be Morocco
Costco? you mean the grocery/supermarket that is around the corner
Huh? lol i rlly don’t know what that or this is but okay.
Answer:
If a city has rocky soil or gets very little rainfall the city won't be practical for farming they my turn toward fishing, hunting of imports from other places.