复用段倒换的实质是故障点两端的网元倒换，其余网元穿通

Selina, Michael, Tony and Sam enjoy listening to the radio. Read the following description and help them make proper choices.
57. ________ Tony, a sports lover, always cares much about sports events. He dreams to be a sports reporter after graduation.
58. ________ Michael is a university student. He likes music very much, especially rock and pop music.
59. ________ Sam is a teacher. He is one of the most popular teachers, because he always likes to tell his students what is going on world widely. So he needs to know global events of all kinds.
60. ________ Selina has three children. They are very lovely. They are interested in drama, reading and watching TV as well.

A. BBC Radio 3 BBC 3 broadcasts radio entertainment all day, every day. Hear the original radio comedies which became TV hits and the all-time comedy greats. There’s drama as well as reading of favourite books and a daily show just for kids.	B. BBC Radio 2 BBC Radio 2 Music celebrates the very best in music. It’s a station for people who are passionate about rock and pop music. The station plays a rich mix of modern and classic artists and is devoted to the success of new rising bands.
C. BBC Radio 1 Devoted to giving you comments on news and sports events. Special rights on all the major sports events including up to the minute news and debates.	D. BBC World Service World Service gets to the heart of global events. Programmes cover news to science and the environment to arts, religion and music of all kinds.