Whilethekindsofinstructionofferedintheseprogramswilldiffer,DLusuallysignifiesacourseinwhichtheinstructionspostsyllabi(课程大纲),readingassignments,andschedulesonWebsites,andstudentssendintheirassignmentsbye-mail.Generallyspeaking,face-to-facecommunicationwithaninstructorisminimizedoreliminatedaltogether.
Whataccountsforthehighdrop-outratesforonlinestudents？
A)Thereisnostrictcontrolovertheacademicstandardsofthecourses.
B)Theevaluationsystemusedbyonlineuniversitiesisinherentlyweak.
C)Thereisnomechanismtoensurethattheymaketherequiredeffort.
D)Lackofclassroominteractionreducestheeffectivenessofinstruction.
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