这里牵扯到be made of和be made from第一个be made of是指不经过加工，能直接看出原材料，例如桌子是由木头做成的，The desk is made of wood.
第二个be made from是指经过加工，不能直接看出原料．例如书本是由木头做的．The book is made from wood.纸张当然是看不出原材料的啦，所以呢，改为paper is made from wood.望采纳哦~~
paper is made from wood
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