题目

The bed ____wood ____three separate parts. A. is made from; is made up of   B. made by; is made with C.made of; is made of    D. is made up of; is made by 答案：C 解析: 区别be made of 与be made up of。前者意为“用……制成的”；后者是“由……组合而成”。从句子结构分析，名词bed后的是定语，应用过去分词短语，句子的主谓是被动关系，意为“由三个部分组成”，故用is made up of。

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