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Unit 3 Under the sea 导读：随着网络的不断发展，传统的学习模式势必受到冲击，各种新的学习模式如潮水般涌现，其中最具有冲击力的便是在线学习(online learning)。这种全新的学习方式以其轻松便捷，资源丰富等优势而备受青睐。 Task: What are the disadvantages of online learning？ As we all know, learning is a continuous process and online learning is the perfect medium which provide right platform for everybody to fulfill one desire of learning through the various stages of life. The only difference between the formal teaching process and online learning education is the medium through which they are imparted. Online learning education provides one with convenience and flexibility where one can choose the time and place of receiving education as per one convenience. Online learning education is not everyone piece of cake and it requires sheer commitment and dedication from students in order to attain its objective. To effectively benefit from an online learning education one has to be disciplined, motivated and organized in his approach and learning process. There is not a regular teacher involved in this process to keep an eye on the students so the students themselves should be responsible enough to finish their task timely. 请根据语义及提示写出单词 | 
