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题目材料：
Archaeologists agree that corn agriculture, first developed by Native American peoples of what is now Mexico, was adopted by Native Americans of what is now the southwestern United States during the Late Archaic period, but the extent of these Late Archaic peoples' dependence on corn agriculture is debated. Some archaeologists infer from the presence of houses storage pits, and large quantities of corn kernels at Late Archaic sites that the inhabitants, once nomadic hunter gatherers, had become settled farmers who, although they lacked the ceramic vessel-making technology typically associated with agriculture, grew and depended on corn. But other evidence strongly suggests that while Late Archaic people grew considerable quantities of corn, it was not their dietary mainstay. Food-processing equipment found at the sites indicates that Late Archaic people continued to rely heavily on wild plant foods. Corn is not a particularly nutritious food. People whose diets are heavily dependent on corn today soak it in limewater and grind it to prepare mush, processes that increase corn's nutritional value; these steps would have been difficult to accomplish without ceramic vessels.
以上解析由 考满分老师提供。
