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Acoupleofyearsago,individualscanonlytakecoursesatrealschools.Inotherwords,onlywhentheygoouttoschoolsbythemselveswilltheyhavelessonswhichtheywanttohave.Howeverinrecentyears,withthedevelopmentofinternetandeducationmode,onlineteachinghasbecomeincreasinglycommon.Thiskindofteachingmodemeansthatastudentjustneedstohaveclassessittinginfrontofacomputerathome,whichappealingtolotsofpeople.Itiswidelyacknowledgedthatonlineteachinghasitsapparentmerits.Firstandforemost,sharedresourcesonlineareaccessibletoallpeople,whichcostsalittleatthesametime.Thisfeaturebringsaboutsignificantbenefitsespeciallytothosewhofailtoaffordthatmanycoursesatrealschools.Secondly,onlineteachingmakesitcomearealitythatoneisabletostudyatthebestpacesuitableforhimaccordingtohisownschedule.Lastbutnotleast,studyingathomewithoutgoingoutismuchmorecomfortableaswellasconvenienttobusypeopleincontemporarysociety.Meanwhile,thereisnodenyingthatonlineteachingalsohasdemeritsthatcannotbedismissed.Foronething,onlineteaching,notlikeface-to-faceteaching,lacksinteractionbetweenteachersandstudents,causingteachersnottoreceivefeedbacksfromstudentsintime.Foranotherthing,forpeoplewhoarepooratself-discipline,learningonlineathomewillbealesseffectivewaysincetheyareeasiertobedistractedbyotherthings.Besides,allofonlineteachingcoursesareready-maderatherthancustom-made,thatistosay,itistroublesometobeflexiblewhenchangesareneeded.