作者：英吉
Maize contains the vitamin niacin, but not in a form the body can absorb. Pellagra is a disease that results from niacin deficiency. When maize was introduced into southern Europe from the Americas in the eighteenth century, it quickly became a dietary staple, and many Europeans who came to subsist primarily on maize developed pellagra. Pellagra was virtually unknown at that time in the Americas, however, even among people who subsisted primarily on maize.
Which of the following, if true, most helps to explain the contrasting incidence of pellagra described above?
A.Once introduced into southern Europe, maize became popular with landowners because of its high yields relative to other cereal crops.
B.Maize grown in the Americas contained more niacin than maize grown in Europe did.
C.Traditional ways of preparing maize in the Americas convert maize’s niacin into a nutritionally useful form.
D.In southern Europe many of the people who consumed maize also ate niacin-rich foods.
E.Before the discovery of pellagra’s link with niacin, it was widely believed that the disease was an infection that could be transmitted from person to person.
题目分析：A说一旦介绍到欧洲，maize就在农场主中比较流行的原因是什么，原文没说过这个，杀。B说美国包含的maize比欧洲的maize包含niacin要多，就算多了，真不证明欧洲的niacin少呢？A比B多B就一定少吗？发散选项，杀。C说美国的烹调方式让niacin能吸收，文章第一句就谈过这个信息，留着。D说南欧这些人吃maize是也吃饱含niacin的食物，吃了这种食物怎么还得病，解释不了原文，杀。E说在发现病因之前，这种病别人为是人传人的，原文就没提过这个，杀。
