Art teacher: "What we are looking at now are paintings by Xu Yuan of the Qi Dynasty. His paintings are extremely valuable, but very few have been handed down."
History teacher: "What major changes occurred in the historical process during the Qi Dynasty?"
Student: "From slavery to feudalism."
Girl A: "I read a novel last night. It said that King Qi and Xu Yuan had an adulterous affair. It's obvious that they can't fight each other. It's so fake."
Girl B: "Are you lying? How did you learn history? King Qi worked as a slave in the Xu family."