ebarorfromalate-nightstudygroup.TheCollegeAloneprogramgivesstudentswhoareworkingaloneatnightpeaceofmind.Onceastudentcallstheoffice,herpositionisrecorded,asishertimetoleavetheplaceandwheresheisabouttogo.Studentsareprovidedwithanumbertheycancallcampussafetyoffice24hoursaday,7daysaweek.And12collegepayphonesarealsoconnectedtotheoffice—nomoneyneeded.Here,we’retryingourbestsothatyourchildrenaresafewhilethey’reattendingtheuniversity.听下面一段独白,回答第18至第20题。18.Whydoestheuniversityofferthetwoprograms?AA.Tokeepstudentssafewalkinglateoralone.B.Toprovidebetterhealthcareforstudents.C.Tohelpvisitorstouraroundthecollege.19.WhencanstudentscallCampusSafetyOffice?BA.From7p.m.to7a.m.B.Anytimeoftheday.C.Frommidnightto7a.m.20.Towhomisthespeakermainlytalking?CA.Touristsatthecollege.B.Newteachers.C.Parentsofstudents.