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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Pony Express
California
American
Fresh horses were at each station. The riders, with their heavy mailbags, changed horses at every station. They continued riding full speed for a total of about 100 miles. Then another rider took over and continued riding. The Pony Express riders rode through dangerous territory. Bad weather didn't stop these tough riders. They rode through rain, snow, hail, both night and day. The riders, therefore, had to be both brave and strong. Most of the young Pony Express riders completed ride successfully. Some of the riders became famous for their courage and bravery during difficult rides. In October 1861, the telegraph reached California. The Pony Express disappeared after this and became a short but exciting chapter in American history.