Unit 8 The Seasons and the Weather,Topic 3 Lets celebrate,Lets talk,What festival is it,When is ,How do people celebrate ,Christmas is the most important festival in many countries,Christmas,What do you know about Christmas ,最重要的,go shopping,clean their houses,Before Christmas Day,People are busy preparing for it,Christmas card,They often give Christmas cards to their friends,Christmas tree,People decorate Christmas trees with colorful lights, balls, stars and so on,装饰,五彩缤纷的,church,go to church,