四级考试是许多童鞋必须通过的考试，其重要程度不言而喻。希望通过四级听力天天练，童鞋们可以提高听力水平，高分通过四级，冲刺六级。

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Hints:
the Untied States
New York
California
East coast
Missouri
Pony Express
St. Joseph
Sacramento
In the United States today, we can send a letter from coast to coast in just a few days for well under half dollar. But in the mid 1800s, trains and horse-drawn coaches carried mail. It took many weeks for news to travel from New York to California. In 1860, the railroad and telegraph reached only from the East coast to Missouri. Horse-drawn coaches, which were very slow, then carried the mail from Missouri to California. In April 1860, the Pony Express began to carry the mail from St. Joseph, Missouri, to Sacramento, California. The trip took just ten days -- half the time the coaches took. The Pony Express was a horse relay system. There were stations every ten or 15 miles along the route, which was nearly 3,200 kilometers long.