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ching.  In  the  end,  the  analytical framework for this thesis will be proposed and explained.

2.1 An Overview of MOOC 
In  this  part,  the  origin  and  development  of  MOOC  are  presented  in  order  to  make clean the background of MOOC. Then, the author reviews previous studies on MOOC aiming to find out deficiency of previous studies on MOOC.  MOOC is short for “Massive Open Online Course”. It is a sort of online education mode  which  is  free  for  charge,  massive,  open.  It  aims  to  spread  courses  of  high quality into every corner in the word.  It is generally acknowledged that the origin of MOOC is from open course based on  the  internet  (Wang  &  Dou  2014).  As  early  as  2001,  Massachusetts  Institute  of Technology  (MIT)  launched  the  Open  Courseware  Movement,  which  provided learners  all  over  the  world  with  courseware  of  the  university  for  free.  Gradually, world  top  universities  including  Harvard  University,  Yale  University  and  Stanford University have joined the Movement. This movement served as a stepping stone for emergence of MOOC. In 2007, Salman Khan established “Khan Academy” providing videos  of  different  subjects  online  for  free,  which  accelerated  the  emergence  of MOOC.  In  2008，professor  Alec  Couros  from  University  of  Regina  of  Canada established  another  open  online  course  called  “Media  and  Open  Education(EC&I 831)” and invited many specialists to take part in remote education. At the same year, Dave  Cormier  and  Bryan  Alexander  put  forward  the  term  MOOC.  In  2012,  MOOC achieved  flouring  development.  Three  important  MOOC  platforms  including Coursera,  MITx  and  Udacity  were  established.  On  account  of  the  establishment  and promotion of MOOC including Coursera, MITx and Udacity, MOOC got the attention of people all over the world and millions of students learnt by MOOC.  
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2.2 Overview of Multimodal Discourse Analysis 
In this part, multimodal discourse analysis is overviewed.  To begin with,  appearance and development of multimodal discourse analysis are presented in order to work out the development situation of multimodal discourse analysis at home and abroad. Then, studies  on  multimodal  discourse  analysis  and  studies  on  multimodal  discourse analysis  of  classroom  discourse  are  reviewed  attempting  to  explore  the  limitation  of the previous studies in this field. From  the  aspect  of  technology,  the  development  of  technology  changes  greatly the  information  spreadin本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。