判断下列对话是否合理。
1. —Where's your lab? （_____）
—It's on the sixth floor.
2. —Do you know the postman？ （_____）
—No, thanks.
3. —Is this your study? （_____）
—Yes, it is.
4. —What class are you in? （_____）
—I'm in the reading room.
5. —Can I read this book? （_____）
—Yes, you're right.
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