PASSAGE THREE [br] What is the word used to refer to the residue of "calcium car

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问题 PASSAGE THREE [br] What is the word used to refer to the residue of "calcium carbonate, silica, iron oxide and alumina" that partially melted in a special kiln?

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答案 Clinker.

解析 原文第一段第三句提到将几种原料进行高温熔合,下一句为:“The result,clinker,is mixed with gypsum and ground to make cement,a basic ingredient of concrete.”,即熔合后得到的物质为clinker,故答案为“Clinker.”。
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