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~~
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