GWD-5-Q16: Maize contains the vitamin niacin, but not in a form the body can absorb.  ellagra 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. ellagra 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.[C] 刚刚看了好久都没弄懂 这答案啥关系喃？ 哪位XDJM帮偶看看呀~ -- by 会员 爱兔兰 (2010/9/26 12:41:00)
小兔，我想你要先把这道题几个方面列一下。前提，原因，结果，都列出来；另外你是说不明白什么？不明白这选项为什么正确？还是不明白和某个选项差别在哪里？还是看了题目就觉得选项都不对？等你先把这些问题想清楚，我再跟你说说我是怎么看这道题目的。
对于总结的问题，就像我前面说的，我建议花一些时间，把cr的因果逻辑链条写出来，加深印象，实际也是重新审视自己思维的一个过程；不要怕做旧题，800大牛曾经说过，他最喜欢做旧题，因为每次都能有不同的体会，这些不同的体会其实就是你的思维方式不断完善的过程。 | 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2010-9-26 12:59:09
楼主