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Lesson21BooksorComputers?Words&expressionspressappearmodernelectronicselln.印刷机；新闻界v.出现；呈现；来到adj.现代的；新式的adj....
Unit4TheInternetConnectsUsLesson21:BooksorComputers?Warm-up1Presentation2LanguagePoints3Exercise4Warm-upFreetalkHowcanwegetknowled...
Lesson21:BooksorComputers?Learningaim:1.Learnaboutthehistoryofthebooks.2.Knowaboutthefountainoftheprintingpress.Learningimportantp...
