My sweater is made ----wool while your overcoat is made----a

of,from
be made of..能看出原材料的,即物理变化,be made from...不能看出原材料的,即化学变化
我的毛衣是用毛线做的,而你的外套是用动物的皮做的.毛衣用毛线做的能看出原材料,外套用动物的皮做的不能看出原材料.