__5__

　　effects ●__6__diet products instead of healthy foods__7__our bodies from having basic nutrients.

　　●The chemicals __8__into diet products are potentially dangerous.

　　__9__ We should__10__diet products and therefore prevent the psychological harm that comes from using them.

　　2

　　What is elearning？Elearning is essentially the computer and networkenabled transfer of skills and knowledge，whose content is delivered via the Internet，audio or video tape，satellite TV，and CDROM.

　　Elearning dates back to the early 1960s when Stanford University psychology professor Patrick Suppes experimented with using computers to teach math.As early as 1997 William D．Graziadei published an article which described developing an overall strategy for technologybased course development and management for an educational system.Today people are using many technologies in elearning，blogs and virtual classrooms included.

　　There are different types of elearning that are available.Some educational experts suggest that different types or forms of elearning can be considered as a continuum，from no elearning，i.e.no use of computers or the Internet for teaching and learning，through classroom aids，such as making classroom lecture PowerPoint slides available to students and through a course website，to laptop programs，where students are required to bring laptops to class and use them as part of a facetoface class，to mixed learning，where classroom time is reduced but not eliminated，with more time devoted to online learning，to fully online learning，which is a form of distance education.

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