A superstar【B1】______ is someone who has become famous in sports, or films,

A superstar (36) usually is someone who has become famous in sports, or films, or popular music, someone like Michael Jackson. In the middle nineteen (37) eighties, Michael Jackson made a record (38) album called Thriller. It quickly became the most popular (39) recording in the history of music, and it made Michael Jackson a superstar. The word "super" means something that is (40) extremely good. And of course, a star means a person who is (41) famous. So people use "superstar" to (42) describe the top people in sports, (43) acting and music.
    One of the most famous sports superstars in the United States was a boxer named Muhammad Ali. (44) As a young man, Muhammad Ali won a gold medal in the Olympics as a boxer.
    Then he became the heavy-weight boxing champion of the world. (45) Before long, he was known as one of the most famous boxers in sports history.
    the United States. He was a true superstar. Everyone knows his name.
    (46) But like the stars in the sky, a superstar fades from the sight as time passes, many young people, for example, know little about Muhammad Ali these days. Superstars are loved by millions of people today, but forgotten tomorrow.