外研版（2021）必修第二册Unit2Let’scelebrate!SectionⅠVideo&Listeningandspeaking导学讲义
Unit 2　Let’s celebrate。 背景导学 有没有注意到圣诞节的时候到处是 红配绿呢?你了解它的来源吗?一起去 看看吧。　 Why are red and green the colors of Christmas? As the last Thanksgiving leftover is consumed and the calendar flips to December, the unmistakable red-and-green flood of the Christmas season comes into view. The two colors fill malls and living rooms around the world, and exist in nearly every decoration, strand of lights, and ugly sweater on store shel ...