英文翻译中文长篇（上）

因为文章比较长，所以分成两个问题放出来。呵呵
以下是前4段，还有后3段。谢谢大家的帮忙了。
    The First Americans
    When did the first immigrants reach America?Scientists disagree on the date,but some say it may be much earlier than anyone thought.
    When Columbus "discovered"America in 1492,he found people already living there.Thinking he had landed in the East Indies,he called these people "Indians".But they didn't call themselves "Indians".Stretching from the top of North America to the tip of South America were many different groups,each with its own name and way of life.
    Many scientists believe that the ancestors of these people migrated to America from Asia about 11,500 years ago.At the time,the morthem half of the earth was covered in ice;a lot of the land that is now under water,was then dry land.Experts believe that people from Siberia followed the animals that they hunted and traveled to Alaska over land that is now a 50-mile body of water called the Bering Strait.
    When did these people migrate to the New World?This is a difficult question to answer exactly.Archeologists look for clues in the earth by digging for the remains of these early peoples.Along with bones from humans and animals,they uncover pieces of pottery,tools,and even the remains of campfires.Then they use a special technique,called radiocarbon dating,to figure out the age of these artifacts by measuring the amount of radioactive carbon in them.

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