根据短文内容选择最佳答案。(Choose the best answers according to the passage．)

　　In 1885, a young doctor named Arthur Conan Doyle opened offices in London．He wanted to be a successful doctor but for some reasons he never found enough patients．To kill the time, he began to write stories and send them to the newspaper．

　　Conan Doyle's stories were about a clever detective, Sherlock Holmes．Conan Doyle wrote that Sherlock Holmes lived at 221 B Baker Street in London, and people with problems came to him for help．Often police detectives came to Sherlock Holmes with their problems, too．He was able to solve mysteries(神秘的事)that the cleverest policemen in England were unable to figure out．

　　Sometimes Sherlock Holmes could solve a mystery without leaving his chair．He listened carefully to the information his customer gave and figured out the answer．At other times he spent days or weeks looking for clues．Sherlock Holmes travelled to different cities and countries to solve the mysteries．Sometimes he wore disguise(伪装衣)and pretended to be an old man, or a sailor．Holmes did anything to find out the answers to the mysteries he was working on．

　　Sherlock Holmes is the most famous detective in English literature(文学), but many people don't understand that he is a fictional character(小说人物), not a real person．The English post office reports that people send mails to Sherlock Holmes at 221 B Baker St．even he gets more than 2, 000 letters every year．

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