Whilethekindsofinstructionofferedintheseprogramswilldiffer,DLusuallysignifiesacourseinwhichtheinstructionspostsyllabi(课程大纲),readingassignments,andschedulesonWebsites,andstudentssendintheirassignmentsbye-mail.Generallyspeaking,face-to-facecommunicationwithaninstructorisminimizedoreliminatedaltogether.
ManystudentstakeInternet-basedcoursesmainlybecausetheycan_____
A)Earntheiracademicdegreeswithmuchlesseffort
B)Saveagreatdealontravelingandboardingexpenses
C)Selectcoursesfromvariouscollegesanduniversities
D)Workontherequiredcourseswheneverandwherever
参考答案