Raiden

During the lesson, Teacher Raiden only points to the country of flag one by one, then asks my daughter what is the country of the flag. I am just wondering if it is a geography lesson or an English lesson? My daughter is only 4 years old. How can she know over 20 countries of flags in this world?

I would suggest that she is not only keep silent and listen to my daughter, but she may provide some hint. for example, describe of country, some highlights for a country or location of the country...