2级
单选题The word "them" in the phrase "the complexity and effect of his use of them" in Paragraph 4 refers to _________.
参考答案：C进入在线模考
推断题型
根据本句结构，应是the contrast between A and B，A在此指的是the simplicity of the materials，B指的是the complexity and effect of his use of them，因此them指的应是前面 the materials。因此答案为C。
根据本句结构，应是the contrast between A and B，A在此指的是the simplicity of the materials，B指的是the complexity and effect of his use of them，因此them指的应是前面 the materials。因此答案为C。
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