题目

题型：不详难度：来源：

Books are made _______ paper while paper is mainly made _______ wood.
A. of; of                   B. from; from               C. of; from

答案

C

解析

试题分析：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。