og-102

sunshining

102. Although migraine headaches are believed to be caused by food allergies, putting patients on diets that eliminate those foods to which the patients have been demonstrated to have allergic migraine reactions frequently does not stop headaches. Obviously, some other cause of migraine headaches besides food allergies much exist.
Which of the following, if true, would most weaken the conclusion above?
(A) Many common foods elicit an allergic response only after several days, making it very difficult to observe links between specific foods patients eat and headaches they develop.(A)
(B) Food allergies affect many people who never develop the symptom of migraine headaches.
(C) Many patients report that the foods that cause them migraine headaches are among the foods that they most enjoy eating.
(D) Very few patients have allergic migraine reactions as children live migraine-free adult lives once they have eliminated from their diets foods to which they have been demonstrated to be allergic.
(E) Very rarely do food allergies cause patients to suffer a symptom more severe than that of migraine headaches.

答案选A，我看不太明白ets的解释“ it is difficult to determine which foods cause migraines, then some foods that cause allergic reactions might not have been demonstrated to do so. Hence, if choice A is true, eliminating foods that have been demonstrated to cause migraines might not eliminate migraines, even if food allergies are the only cause of migraines. Choice A
is the best answer.”

什么意思？题名认为是food allergy导致偏头痛，然而去掉导致偏头痛过敏反应的食物没有阻止偏头痛，说明肯定有food allergy之外的原因。我觉得很有道理啊？

ETS的答案是说“因为无法确定是那种食物”，所以weaken吗？

请教大侠，多谢了

panyuesheng

我解释一下看一看：原来题中是说把病人自己认为过敏的食物去掉。而A选项说有的食物引起过敏反应是在几天之后，所以病人认为这些食物并没有引起过敏而没有排除掉。实际上引起头疼的还是这些没有立即引起过敏的食物。所以选A。