1.??Most Americans think that ice cream is as American as baseball and applepie.But ice cream was known long before American was discovered.The Roman emperor Nero may have made a king 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 back recipes for chilled and frozen milk from China.Hundreds of years later,ice cream reached England.It is said that King Charles I enjoyed that treat very much.There is a story that he bribed his cook to keep the recipe for ice cream a royal secret.Today ice cream is known throughout the world.Americans alone eat more than two billion quarts a year. 问题：The Roman emperor Nero hired men to ( )

A. make ice cream for him

B. bring ice cream from China

C. guard the secret of ice cream

D. bring ice to cool his drinks