A jet plane crosses the continental United States from east to west in about five hours. Taking off from an Atlantic coast airpo

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问题     A jet plane crosses the continental United States from east to west in about five hours. Taking off from an Atlantic coast airport, the plane is soon flying over the gentle slopes of the Appalachian Mountains. Then, for hundreds of kilometers it crosses the fertile fields of the farm belt of the great Middle West. To the north, on clear days passengers may see the five Great Lakes located between the United States and Canada. Continuing into the west, the plane flies over vast prairies and rough cattle-grazing country. Soon the snow-topped Rocky Mountains appear in the distance. After crossing these high ranges, the plane can almost glide down into the rich valleys of California and, finally, to a landing not far from the beaches of the Pacific Ocean.
    The United States has long been known as a ’ melting pot’, because many of its people are descended from settlers who came from all over the world to make their homes in the new land. The first immigrants in American history came from England and the Netherlands. Attracted by reports of great economic opportunities and religious and political freedom, immigrants from many other countries flocked to the United States in increasing numbers, reaching a peak in the years 1880-1914. Between 1820 and 1980 the United States admitted almost 50 million immigrants.

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答案 一架喷气式飞机由东向西横穿美国大陆大约需要5个小时。飞机从大西洋海岸机场起飞,很快就飞越了阿巴拉契亚山脉的缓坡。然后,它穿过中西部农业区绵延数百公里的肥沃的田野。在晴朗的日子,乘客向北眺望,可以看到位于美国和加拿大之间的五大湖。飞机继续向西飞行,越过辽阔的大草原和坎坷起伏的牧场。很快,远处便出现峰峦积雪的落基山脉。飞越这些高山峻岭之后,飞机几乎可以从高空向加利福尼亚肥沃的盆地滑翔而下,最后在离太平洋海滨不远的机场着陆。 美国一直被认为是一个“大熔炉”,因为许多美国人都是来自世界各地的定居者的后裔,他们在这片新大陆上建立了自己的家园。美国历史上第一批移民来自英格兰和荷兰。他们被大量的经济机会、宗教和政治自由的报道吸引,许多其他国家的移民涌入美国,并在1880至1914年达到顶峰。1820年至1980年间,美国接收了近5 000万移民。

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