Listening Quiz: Trả Lời Câu Hỏi Bệnh Nhân về Thành Phần Vắc-xin – Advanced Level

1. What is the conversation mainly about?
2. According to Daniel, what do preservatives do in vaccines?
3. What does Daniel say about mercury in modern vaccines?
4. Why does Daniel mention that many websites share wrong information?
5. How does Sarah seem to feel at the end of the conversation?

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