What are the made of?РshirtsРUnit 5РcottonРTalk about the materials(材料).?How many materials do you know?? What are they?РLead inРchopsticksРwoodРWhat are the chopsticks made of?РwindowРglassРWhat is the window made of?РcoinsРgoldРWhat are the coins made of?РstampРpaperРWhat is the stamp made of?РforksРsilverРWhat are the forks made of?РblouseРsilkРWhat is the blouse made of?РringsРsteelРWhat are the rings made of?РPresentation?1a GROUPWORK?What are these things usually made of? Match them with the materials. More than one answer is possible.