A、Typesetter. B、River pilot: C、Soldier. D、Publisher. B细节题。文中只有提到river pilot时说：Twain loved this job and many．of his books show it

Mark Twain, who wrote the story we’re reading, traveled quite a lot, often because circumstances, usually financial circumstances forced him to. He was born in Florida Missouri in 1835 and moved to Hannibal Missouri with his family when he was about four years old. Most people think he was born in Hannibal. But that isn’t true. After his father died when he was about twelve, Twain worked in Hannibal for a while and then left so he could earn more money.
    He worked for a while as a typesetter on various newspapers and then got a job as a river pilot on the Mississippi. Twain loved this job and many of his books show it. The river job didn’t last however, because of the outbreak of the civil war. Twain was in the army for just two weeks and then he and his whole company went west to get away from the war and the army. In Nevada and California Twain tried to find silver and gold without much luck but did succccd as a writer.
    Once that happened, Twain traveled around the country giving lectures and earning enough money to go to Europe. Twain didn’t travel much during the last ten years of his life, and he didn’t publish much either. Somehow his travels inspired his writing. Like many other popular writers, Twain derived much of the materials for his writing from the wealth of his own personal experiences.