A、Language learners. B、Magazine collectors. C、European journalists. D、Professional travellers. A根据上题的分析，欧洲独特的视听杂志是为了提高听力等语言能力，结合

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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?