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题目材料：
The source of vitamin C in the traditional Inuit diet was long a mystery. Most animals can synthesize vitamin C in their livers, but humans are among the exceptions. If humans do not ingest enough vitamin C the result is scurvy, a potentially fatal connective-tissue disease. Most Americans today get ample supplies from orange juice, citrus fruits, and fresh vegetables. But getting enough vitamin C from a ship's provisions was especially tricky for explorers voyaging to the Inuit' s native polar regions, and scurvy plagued European and United States expeditions there even in the twentieth century. However, Arctic peoples were free of the disease, even in the long winter, when they subsisted entirely on meat and fish they caught, often eaten raw.
以上解析由 考满分老师提供。
