4、 is the powder made of?这些粉是由什么做成的?Plastic ['plæstɪk]adj.塑料的;n.塑料制品Wood [wʊd]n.木材;木制品;树林Metal ['mɛtl]n.金属;合金Thirsty['θɝsti]adj.口渴的,口干的;渴望的Stick[stɪk]n.棍;手杖II.ExercisesDialogue1C—Herecomesmysecretary.Sheisanextremelygood-lookingyoungwoman,don'tyouthink?—Yes,butsheisn'tveryg