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My sweater is made ____wool while your overcoat is made____a

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My sweater is made ____wool while your overcoat is made____animal fur.选填Of,from.并说明一下理由,
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.