科技类文章历史上考过两次，也可以和教育结合在一起去考。这类文章写起来比较简单，总是比较利弊。
Key words:invention and innovation;new gadgets;irreplaceable;weighing pros and cons;valuable supplement
Clearly described in the cartoon are a professor and his student having a math class attentively.Much to our surprise,they are disturbed by an uninvited invention and innovation–online courses.Having class face to face with professors or attending lectures online?This is a problem troubling many people involved.
No doubt that traditional classes in which professors imparting knowledge directly to students are irreplaceable.Having in touch with students for a long time,educators know what their learners require,thus can tailor teaching materials based on the familiarity.In addition,with teachers right beside them,college students can turn to experts for help conveniently once they encounter problems.
In spite of the numerous merits mentioned above,many students prefer online courses for their merits.To begin with,online courses provide them with much more choices hardly imagined before.Nowadays,lectures given by some world-renowned professors from prestigious institutions are available for students even in remote areas.More importantly,once downloaded,these online courses can be learnt and relearnt at whatever time that students consider convenient.
In summary,online course has both advantages and disadvantages.Used properly,it can serve as a valuable supplement.Therefore,t is the uses to which it is put that determines its value to students.
