In city we have ac but what about the villagers how do they keep their house cool answer

It truly depends on how advanced and/or modern the village is and where it is located. Many villagers have A/C, some have Central Air. They may open windows, or use electric fans. Nothing is drastically different. I hope this helped :)

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.

probably 3 since archeologists and historians don’t understand there writing.