题目内容：

Do you know when and where ice cream got its start? It's an international favorite with a long and interesting history

The earliest ices were eaten in China many years ago. The people would put orange juice on ice .Later, this idea traveled to Italy. Nero, the emperor of Rome between 37 and 68 A.D, liked to eat ices as a special treat between violin lessons. He ordered runners to run to the mountains, get snow and quickly run back to the palace; The snow was mixed with fruit juices and nuts.

Around 1660,Coffee shops serving ice cream were very popular in Paris. Most of the coffee shops were owned by Italians. The first successful one was opened by a man from Sicily named Francesco Procopio.

Ice cream was probably brought to America in the early 1700's, and quickly became the favorite of American presidents. George Washington had ice cream pots and machines in his kitchen. Dolly Madison the wife of President Madison, was the first person to actually serve it in the White House. She made her guests very  happy when she served her favorite dessert.

Before ice cream was sold in stores, it was made and frozen at home. it took a lot of work to mix cream，eggs，fruit，and salt, and then to freeze it. Nancy Johnson, an American woman who was good with machines, invented the hand-turned ice cream freezer in 1846. Five years later, Jacob Fluse opened the first ice cream business, in Baltimore, Maryland His business quickly spread to other states. Today in the United States,  ice cream is not only a food , it is away of life.

1.What's the passage about? (No more than 10 words)

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2.From which country did ice cream begin to travel in the world? (No more than l word)

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3.What does the underlined word "it" refer to in paragraph 4? (No more than 3 words)

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4.Who was the first person to serve the ice cream in White House'? (No more than 5 words)

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5.According to the passage ,what made ice cream so popular in the USA? Please list two reasons．