单项选择题
A.a riverboat pilot B.a printer C.a gold miner D.a famous writer
A.become a riverboat pilot B.gather material for his books C.make money D.enjoy himself
A.Twain was successful in writing at last. B.Twain was a famous humorist. C.Twain's writing style was easy to be understood. D.Twain wrote many poems about Mississipp