阅读短文，还原句子。阅读下面的短文，从文章后所给的A-E五个句子中，选择四个句子填入文中空缺 处，使短文内容完整、意思通顺。 Alex Harley was born in the northeast of New York in 1921, but he spent most of his early life with his mother's family in southem Tennessee. His grandmother told him stories about their family. 1_____ He was a slave (奴隶) from Africa and his name was Kunta. Alex Harley went to school and then to college. In 1939, he joined the US coast-guard. As he was a black, his job was to wait tables and wash dishes. 2_____ He served in the coastguard for 20 years. After he retired, he put all his time into writing. Alex Harley remembered the stories his grandmother had told him. He began to study his family history. After a lot of research, Harley decided that Toby was proba- bly Kunta Kinte of the West African Mandingo people, who was caught near the village of Juffure on the Gambia River. He was sold as a slave in Annapolis, Maryland in 1767. Then Harley made a trip to Gambia. 3_____ The African historian made his research stronger. Alex Harley wanted to tell the experiences of the black people in 18th and 19th century of America. He spent 10 years researching. 4_____ It was published in 1976. After that, it won a special prize. A few years later, a film series (连续剧) based on Harley's book was shown on American television. A. She said their history began with Toby. B. He was interested in his family history. C. He talked with a history expert in Juffure. D. In his spare time, he learned to write stories. E. Then he wrote his family story for the book Roots.