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be made of/from(单选)

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Books are made __________ paper while paper is mainly made __________ wood. A. of; of B. from; from C. of; from D. from; of
解题思路: 见过程
解题过程:
选C. 考点是be made of .... 表示能看出制成品的原材料是什么, be made from... 表示不能看出制成品的原材料是什么,
句意是书是由纸制成的,能看出,所以用be made of...
纸由木头制成的,不能看出来,所以用be made from...
最终答案:略