A、They are very easy to read. B、They are cheap and popular. C、They are translated into English. D、They are convenient for the us

Join the thousands of professionals and international travelers who depend on Champs-Elysees Schau ins Land, Puerta del Sol, and Acquerello Italiano to help them stay in touch with the languages and cultures they love. Designed to help you greatly improve your listening, vocabulary, and cultural IQ, these unique European audio-magazines are guaranteed to give you enthusiasm and determination to study the language — or your money back.
    Each audio-magazine consists of an hour-long program on CD or DVD. You’ll hear interviews with well-known Europeans, passages covering current events and issues as well as feature stories on the culture you love. A small book, which goes with CD or DVD, contains a complete set of printed materials, notes(background notes included)averaging 600 words and expression translated into English. The result: you build fluency month in and month out.
    To help you integrate language study into your busy life, we’ve made each audio-magazine convenient. Work on language fluency while driving to work, exercising, or cooking — anytime and anywhere you want.
    Best of all, each program is put together by professional broadcasters, journalists, and editors who have a strong interest in European languages and cultures. That enthusiasm comes through in every edition. From New York to London to Singapore, the users tell us no company produces a better product for language learners at all levels. Ring for more information, or order at www. audio-magazine.com. We guarantee that you have nothing to lose. If it’s not for you, let us know within 6 weeks and we will completely reimburse you.
Questions 19 to 21 are based on the passage you have just heard.
19. What do we know about the audio-magazines in the passage?
20. Who are the audio-magazines mainly for?
21. What is mentioned as a feature of the audio-magazines?