请听下面一段材料,回答第1-3题。 1. What is the main purpose of the talk? A. To tell the students how to use the library. B. To tell the students what to do when ill. C. To tell the students where to go next. 2. Who is the speaker? A. A nurse. B. A teacher. C. A librarian. 3. What will the students probably do next? A. See a doctor. B. Visit the librarian. C. Take some exercise.