Listening Quiz: Lựa Chọn Công Nghệ Kiểm Soát Bụi – Easy Level

1. What are Olivia and Mark mainly discussing?
2. According to Olivia, what do filters do well?
3. What does Olivia say about water sprays?
4. What can be inferred about water sprays from the conversation?
5. What conclusion do Olivia and Mark reach about filters?

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