Listen to a conversation between a student and his psychology professor.
听一段学生和他的心理学教授之间的对话。
Listen to a conversation between a student and his art history professor.
听一段学生和他的艺术史教授之间的对话。
Listen to part of a conversation between a student and his music history professor.
请听一名学生和一位音乐史教授之间的部分对话。
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