【正确答案】 B

【答案解析】[听力原文]
   Good morning, everybody. Today we will continue to discuss music, and today's lecture I'll introduce something about jazz. I believe that there must be many people among you love jazz.
   Jazz began in the early 20th century as a kind of music of black Americans. It was intended for singing, dancing and also for entertainment and atmosphere at parties or social gatherings. The origin of the word jazz is not known, but the term came into common use after the first phonograph records of Jazz were made in 1917. Jazz represents a blending of musical elements from Africa and from Europe. Jazz uses some European ideas of harmony and melody, but the rhythms are more African in origin. It is usually said to be syncopated, that is, it is irregular in rhythm. Besides this, there are many other rhythms in a piece of Jazz music around one basic rhythm. That is to say, it is polyrhythmic. Another important feature of jazz is improvisation. To improvise means to make something up on the impulse of the moment. This is the way jazz is usually played. Jazz musicians have learned to improvise so well that they can make up excellent melodies as they play. A good jazz soloist seldom plays anything the same way twice. Thus, listening to jazz is not like hearing a piece or music that was written long ago. It is like being there when the muck is first being made.
   A major step in the development of jazz was taken by the players in New Orleans. New Orleans jazz, sometimes called Dixieland, was a mixture of different elements. It had the deep emotion of American blues and Negro spiritual as well as elements of European folk music. The New Orleans style involved improvising that was sometimes complex. Often seven or eight players would improvise at the same time. But the most notable new feature of New Orleans jazz was its more complicated rhythm.
   In the 1940s a new approach to jazz began to develop. It had been implied in the playing or Lester Young with the Count Basic band. Another important influence on early modem jazz was guitarist Charlie Christian, who was strongly influenced by Lester Young. At first the new jazz was called bebop, and later, modem jazz. Many of the musical ideas of modem jazz were worked out at gatherings in which the players performed for their own amusement and instruction. Jazz musicians called these gatherings jam sessions. Modern jazz was more complex in harmony and melody than earlier styles of jazz. But a most outstanding feature was its new approach to rhythm. Not only did the players use new rhythms in making their melodies, but the drummers played in a more complex way.
   What's about the origin of the word jazz, a kind of music of black Americans?
细节题。讲座中提到“爵士”一词的起源并不为人所知，但在1917年制作出第一张爵士唱片后，“爵士”一词开始被普遍使用：The origin of the word jazz is not known, but the term came into common use after the first phonograph records of Jazz were made in 1917. 所以答案是B。