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题目材料：
Centuries ago, the Maya of Central America produced elaborate, deeply cut carvings in stone. Given the technology available to the Maya, the carvings could only have been made with tools of stone or iron. Mayan stone tools have been found, but experiments reveal that these tools are not hard enough to make anything but very small markings in the stone used for the carvings. Therefore, the Maya must have used iron tools for the carvings.
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以上解析由 考满分老师提供。
