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标题: 求助GWD5-Q16 Help Help!!! [打印本页]

作者: larryywddd 时间: 2010-11-25 15:18
标题: 求助GWD5-Q16 Help Help!!!
GWD5-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.

为什么B不对呢？？？求NN解释

作者: larryywddd 时间: 2010-11-25 15:18
自己顶

作者: cc621josh 时间: 2010-11-25 16:08
B不是不对，也有这个可能，但跟C比起来，C明显更好更直接，呼应了题干中的“Maize contains the vitamin niacin, but not in a form the body can absorb”，如果题干中写的是"Maize contains the vitamin niacin, but not in that grown from soil condition of majority of European farmlands",可能B就更好了，个人看法。

作者: larryywddd 时间: 2010-11-25 16:30

B不是不对，也有这个可能，但跟C比起来，C明显更好更直接，呼应了题干中的“Maize contains the vitamin niacin, but not in a form the body can absorb”，如果题干中写的是"Maize contains the vitamin niacin, but not in that grown from soil condition of majority of European farmlands",可能B就更好了，个人看法。

-- by 会员 cc621josh (2010/11/25 16:08:26)

3KS 我回头看了看你不感觉C中没有提到题干中的 European 么？这样很有可能导致C很片面的阐述问题

作者: 缨络 时间: 2010-11-25 18:25
如果niacin is not in a form the body can absorb那么多和少是没有关系的反正不能被吸收所以B是不对的

作者: cc621josh 时间: 2010-11-25 19:55

-- by 会员 cc621josh (2010/11/25 16:08:26)

3KS 我回头看了看你不感觉C中没有提到题干中的 European 么？这样很有可能导致C很片面的阐述问题

-- by 会员 larryywddd (2010/11/25 16:30:48)

The point is you need to explain why Americans do not develop Pellagra due to niacin deficiency as Europeans do, even though they all eat Maize, which contains vitamin niacin.
Consider that the vitamin niacin contained in raw Maize is not in form that human body can absorb, there might be some measures taken unconsciously by Americans to convert vitamin niacin from an unabsorbable form to aborbable one. The measure can be cooking method, preparing way, whatever works.

It is just one way to explaination; there is no need to list all possible explainations. In C explaination, European is not necessary here, but might be useful in other exaplainations.

作者: qianyangnet 时间: 2011-1-1 16:29
哥们

先找结论：Pellagra was virtually unknown at that time in the Americas, however, even among people who subsisted primarily on maize.

然后你就要在选项中找那个最可以枪毙以上结论的答案。C说Traditional ways of preparing maize in the Americas
convert maize’s niacin into a nutritionally useful form. 人家都知道怎么把MAIZE'S NIACIN CONVERT出来了，还能不知道PELLAGRA吗？逻辑上可能存在问题，所以C是答案中最合适的。

而B对于以上结论没有直接关系。

作者: lonelyorchid 时间: 2011-1-1 18:55
答案必然是C
原文说Maize中的Niacin不能被直接吸收。美洲人吃了不会生病，欧洲人吃了会生病，所以说明美洲人吃Maize，能吸收Niacin，欧洲人吃Maize不能吸收。最直接的解释就是美洲特殊的加工方式转化了Maize，使得可以被人吸收。

B明显不对。因为原文说了在Maize中的Niacin不能被吸收，所以无论Maize中有多少Niacin，对于人来说都是0。所以含量的多少并不能解释差异。

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