Listening Quiz: Hướng Dẫn Sử Dụng Ống Hít Cho Bệnh Hen Suyễn – Medium Level

1. What is the conversation mainly about?
2. What does David tell Linda to do first?
3. After Linda puts the mouthpiece in her mouth, what does David tell her to do?
4. What can be inferred about Linda during the lesson?
5. How long does David tell Linda to hold her breath?

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