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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.

Which of the following, if true, most helps to resolve the mystery of the source of vitamin C in the traditional lnuit diet?

A.American and European Arctic explorers who adopted an lnuit diet did not develop scurvy.
B.American and European expeditions generally relied on salted or canned meat and dried provisions, none of which provide vitamin C.
C.With the progressive abandonment of their traditional diet, the Inuit have become more susceptible to scurvy.
D.Vitamin C is present in meat and the connective tissue of animals but is destroyed by extended cooking.
E.The fact that fresh fruit and vegetables can ward off scurvy was recognized more than 150 years before vitamin C was identified.

D显示答案

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