阅读理解。根据短文内容，回答下列问题。 Popular music in America is what every student likes.  Students carry small radios with earphones and listen to music before class, after class and at lunch.  Students with cars buy larger speakers and play the music loudly when they drive on the street. Adult (成年的) drivers listen to music on the car radio when they drive to work.  They also listen to the news about sports, the weather, and the life of American people.  Most of the radio programs (节目) play music. Pop or popular music singers make much money.  They make a CD or tape which radio stations use in many places.  Once a popular singer is heard all over the country, young people buy his or her tapes.  Some of the money from these tapes goes to the singer.  Wherever (无论哪里) the singer goes, all the young people want to meet him or her.  Now the singer has become a national (国家的) star. There are other kinds of music that are important to Americans.  One is called folk music.  It tells stories about the common (普通的) life of Americans.  Another is called western or country music.  This was started by cowboys who would sing at night to the cows they were watching.  Today, any music about country life or the love between a country boy and a girl is called western or country music. 1. How many kinds of music are mentioned (提到) in this passage? _____________________________________________. 2. What's the meaning of 'earphone' in Chinese? _____________________________________________. 3. When will a singer become a national star? _____________________________________________. 4. What is the country music about in America? _____________________________________________. 5. What is the best title (标题) of the passage _____________________________________________.