White bread is thought to have a long history.In ancient Egypt, people discovered white bread about 8,000 years ago. There is something interesting about white bread.In the old times,many cities in ancient Greece said they owned the best quality.In the middle ages,bakers in England carefully _ their secrets of making bread.Anyone who hoped to learn the art of making bread must spend seven years on it.In times of war and disasters ,bread and wheat were the first things to bekept closely. However,in the mid-1800s,an engineer from Switzerland invented a new kind mill to produce more white bread at a faster speed.Soon bread making became widely popular all over Europe.In 1928,America had the first company to produce and sell mountains of white bread. How many countries are mentioned in the article?
Four. Five. Six Seven.