未知题型 下列选项中，不能被认作是呆账的是()。
单项选择题 听力原文： Good evening. You are listening to Pop World of BCD International. I'm Sally Brown. Today, we are going to hear Several current hits of the world's most popular artists. Well, at the beginning, I would like to say a few words to my dear listeners who are not very familiar with this program. Because many people want to listen to and understand pop songs, radio producers at BCD International have made hundreds of programs over the years. We not only have access to the stars of the music world, but have a vast library of 'golden oldish' Classics, as well as the 'latest releases'. For those of yon who like a bit of background with your favorite music--there's The History of Pop and The Road to Music. These two series bring you the language of pop music and information about the periods and the artists. If you want to hear from the artists themselves, there's a new series called About the Big Hits. This is based on interviews with popular singers and songwriters. They speak to us about the meanings and ideas behind their songs. If you want to understand the words to the big music hits, Pop Words is the program for you. After all, it's hard enough for native English speakers to understand most pop songs--so, if English isn't your first language, you shouldn't be surprised if the words to many songs leave you in the dark. It was to address exactly this problem that BCD International started broadcasting Pop Words just over 23 years ago...Which of the following is covered in BCD International programs?A．Interviews with radio producers.B．A large variety of pop songs.C．News from the music library.D．Stories about the good old days.
未知题型 保证人与债务人约定，当债务人不履行债务时，保证人必须按照约定履行债务或者承担责任的行为是()。