问题
选择题
Books are made _______ paper while paper is mainly made _______ wood.
A. of; of B. from; from C. of; from
答案
答案：C
题目分析：句意：书是由纸制成的，而纸主要是由木头制成的。Be made of由…制成，从产品中能看得出原料；Be made from由…制成，从产品中不能看出原料。所以选C。
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