For the most part, you are probably only exposed to the music that is played on your favor

For the most part, you are probably only exposed to the music that is played on your favorite radio stations and TV shows, music Web sites, or the music that your friends and family members enjoy. While you probably know a lot about your favorite type of music, it can be a rewarding experience to enlarge your horizons（眼界）, discovering artists and types of music that you’re not familiar with. Who knows, you might discover you like certain types of music you never even considered.
Have you ever wondered about the history and influences of your favorite types of music ? For example, did you know that rock ‘n’ roll originated（起源）from the blues, and that the blues began as a form of musical expression for African Americans during slavery（奴隶制度）？Did you know that most hip-hop is heavily influenced by early rhythm blues and jazz ?
There are many fun ways to learn about different musical styles and their historical roots. For example, if you like hip-hop, listen to some of your favorite CDs and take note of the samples the performers used to create the songs. There is a possibility that the artist used parts of older songs to create the music. You can go to the library or online to learn more about the artists and listen to more of their music by checking out CDs from the library or downloading songs online for a small fee.
You can learn so much about culture and history just by paying attention to different types of music and what is being expressed in the songs. There are so many different styles of music to learn about, and you owe（欠）it to yourself to make an effort to listen to and learn about them.
【小题1】The main topic of this passage is .A．creating musicB．performing musicC．enjoying your favorite musicD．learning about music【小题2】What music did African Americans use to express their feelings of being slaves ?A．Rock ‘n’ roll.B．The blues.C．Hip-hop.D．Jazz.【小题3】How can you learn about culture and history through music ?A．By writing down the names of the music.B．By creating music from older songs yourself.C．By caring about what is being expressed in music.D．By keeping a record of fees after downloading songs online.【小题4】By saying the underlined sentence in the last paragraph, the author probably means that .A．you should try harder to learn about musicB．you should return something to musicC．you should borrow music CDs from othersD．you should buy music CDs yourselfD

(答案→)D 解析：任何事情都要通过现象看本质，音乐也是如此，人们要通过了解音乐来了解音乐的历史。【小题1】主旨大意题。通读全文可知是要人们了解音乐及其历史。【小题2】细节题。根据第二段第三行the blues began as a form of musical expression for African Americans during slavery（奴隶制度）【小题3】细节题。根据最后一段第二行You can learn so much about culture and history just by paying attention to different types of music and what is being expressed in the songs.【小题4】猜测词义题。根据上文所说：世界上有很多种音乐让我们去了解，接下来应该就说：我们应该努力的去了解他们。

就是这个解释