Skillfeed

　　If you are looking to learning a new skill，or improving on your skills in Photoshop，or HTML，it offers unlimited access to high­quality video courses from a worldwide community of instructors.You have a month’s free trial，after which you will pay a monthly fee to gain unlimited access to all courses.See more at https：//skillfeed.com

　　Academic Earth

　　It has linked to over 750 online courses and 8,500 individual online lectures，giving students of all ages access to college courses they may otherwise never experience.Whether learning existing coursework，or learning for the sake of learning，anyone has the freedom to learn at their own pace from world­famous experts，without being charged more.Learn more at http：//academicearth.com

　　UC Berkeley

　　It offers courses in bioengineering，Japanese，legal studies and public health.Since they are recordings of actual lectures，they lack lecture notes and extra materials.However，each course has audio recordings of lectures via iTunes or video recordings of lectures via YouTube.Learn more at https：//ucberkeley.com

　　5．Learners who choose Skillfeed need to

　　.

　　A．equip themselves with the ability to use the computer

　　B．pay some fee if they want to continue after a month

　　C．have some knowledge of the design of website

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