[B] Laid-off workers.
[C] High school teachers.
听下面一段对话,回答第18和第20题。
18.Why does the university offer the two programs?
[A] To keep students safe walking late or alone.
[B] To provide better health care for students.
[C] To help visitors tour around the college.
19.When can students call Campus Safety Office?
[A] From 7 pm to 7 am.
[B] Anytime of the day.
[C] From midnight to 7 am.
20.To whom is the speaker mainly talking?
[A] Tourists at the college.
[B] New teachers.
[C] Parents of students
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