Touchstone is an innovative four-level American English series for adult and young-adult learners of English. It draws on extensive research into the Cambridge International Corpus of North American English: a large database of everyday conversations and texts that shows how people actually use English.
This video introduces the interactive whiteboard software, an interactive version of the Student's Book that includes exercises, audio and video. Find out more about it at http://www.cambridge.org/elt/touchstone/whiteboard.htm.
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