一、寫作思路
首段：介紹在線學習的現狀及發展趨勢，可通過相關數據表明在線學習方式正在被越來越多的人所接受。本段末尾可說明在線學習相比傳統課堂學習的優勢，由此過渡到下文。
中段：解釋在線學習方式迅速發展的原因。首先，在線課程的選擇範圍更廣，覆蓋的學科更全麵。其次，在線學習方式靈活，大學生可自由選擇學習的時間和地點，還可以節省交通和住宿費用。最後，一些世界級的名校都提供免費在線課程，大學生可以通過這個方式聆聽名師教授的課程，由此開闊視野、接觸不同的思想和觀念。
末段：總結全文，提煉在線學習的優勢，並對在線學習的未來提出展望。
二、參考範文和譯文 參考範文
The Rise of Online Learning
96% of traditional universities offer online courses with an enrollment of 4 million students in 2012, while 31% of all higher education students choose to take at least one course on line. We have every reason to believe that online learning is on the rise, and this is mainly because it offers clear benefits over taking courses in a traditional classroom setting.
To begin with, students can choose from a wider breadth of courses about most subjects by studying on line. What's more, with a computer and access to the internet, students can attend courses whenever and wherever they find it convenient, while saving additional costs for transportation and accommodation. Last but not least, since some of the top universities in the world like Yale and Harvard all work to provide free online access to a selection of their courses taught by distinguished scholars, every student has the freedom to explore a better world and be inspired by it.
In a word, by being effective, flexible, and smart,online learning is going to play a bigger role for college students in the long run.