A superstar usually is someone who has become famous in sports or popular music, someone like folk (人们，民间的) 21 Michael Jackson. 22 the middle of 1980"s Michael made a record album (相片册，邮票簿) 23 "Thriller (激情)". It quickly became the most 24 recording in the history of music and it made Michael Jackson a 25 .
The word "super" means 26 that is extremely good. And of course, a 27 is a person who is famous. So people use "superstar" to describe the 28 people in sports, acting and 29 .
One of the most famous sports superstars in the United States 30 boxer Muhammed Ali. 31 a young man, he won a 32 medal (奖章，纪念章) in the Olympics as a boxer. 33 he became the heavy-weight boxing champion of 34 . 35 long, he was known as one of the greatest 36 most famous boxers in sports 37 .
Muhammed Ali claimed 38 he was a champion that he was more famous than the president of the United States, the 39 of the Soviet (苏维埃) Union, 40 the secretary-general of U.N. He is a true superstar. Everyone knows his name.