The reading passage explores the issue of what is old settlements of Chaco Canyon in New Mexico which they call it "great houses" used for, and the reading passage give us 3 idea. The professor 's lecture deals with the same issue. However, he thinks that the 3 ideas from the reading passage are all incorrect. And in the lecture, he uses 3 specific points to support his idea. First, the reading passage suggests that the great houses are used as "apartment building".It is vast and looks like it has plenty of rooms, but the professor argues in the lecture that if the great houses was used for inhabitancy, it must has a lot of fire places for cooking. But it just have few of fire places inside of houses, which means the great houses are not for