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  3. Passage Three What is the word used to refer to the residue of calcium carbonate, silica, iron oxide and alumina that partially

Passage Three What is the word used to refer to the residue of calcium carbonate, silica, iron oxide and alumina that partially

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问题 Passage Three
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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