1 . ______ Americans think that ice-cream is ______ American as baseball and apple pie. But ice-cream was known _______ America was discovered. The Roman emperor Nero may _______ made a kind of ice-cream. He asked _______ men to bring snow and ice from the mountains. He used it to make cold drinks. Traveler Marco polo brought back recipes for chilled and frozen milk from China.

Today ice-cream is known _______.Americans alone eat more than two billion quarts (夸脱) a year.