问题补充:
Books are made paper while paper is mainly made wood.
A. of; of B. from; from C. of; from
答案:
解析: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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