What do most Americans think about ice cream? They consider that ice cream is__

Most Americans think that ice cream is as American as baseball and apple pie. But ice cream was known long before America was discovered.
    The Roman emperor Nero may have made a kind of ice cream. He hired hundreds of men to bring snow and ice from the mountains. He used it to make cold drinks. Traveler Marco Polo brought the method of making cold and frozen milk from China.
    Hundreds of years later，ice cream reached England. It is said that King Charles I enjoyed that treat very muck. There is a story that he ordered his cook to keep the method of making ice cream a royal secret. Today ice cream is known throughout the world. Americans alone eat more than two billion quarts a year.