问题补充:
Books are made paper and paper is made wood and bamboo
A. from, from B. of, of C. of, from
答案:
解析:be made of,be made from的意思都是由……组成,be made of 是可以看出原材料的,be made from是不可以看出原材料的,而题中第一空书是由纸做的,可以看出原材料的,故用be made of;第二空纸是由木头和竹子做的,看不出原材料,故用be made from,
故选C