What do we know about Dylan from the text?

参考解析：

细节理解题。根据第二段最后一句“describing him as one of his favorite poets”可知，他是奥巴马最喜欢的诗人，并非歌手，故A项错误。根据第二段第一句“it chose Dylan for having created new poetic expressions within the great American song tradition.”可知，它选择迪伦是因为他在伟大的美国歌曲传统中创造了新的诗歌表达方式。因此可推出，他用歌曲的形式来写诗，故B项正确。根据第四段第一句“Dylan had been mentioned in the Nobel prediction for years, but few experts expected the academy to extend the award to a genre such as pop music”可知，他多次获得提名，所以人们对他并非毫无期待，故C项错误。根据第四段第二句“He’s the first American winner of the Nobel Literature Prize since Toni Morison in 1992”可知，他是1992年来，美国的第一位获奖者，并非史上第一位，故D项错误。故选B。