Which of the following most logically completes the argument?
The irradiation of food kills bacteria and thus retards spoilage. However,it also lowers the nutritional value of many foods. For example,irradiation destroys a significant percentage of whatever vitamin B1 a food may contain.Proponents of irradiation point out that irradiation is no worse in this respect than cooking. However, this fact is either beside the point, since much irradiated food is eaten raw or else misleading, since_____
(A)many of the proponets of irradiation are food distributors who gain from foods'having a longer shelf life
(B)it is clear that killing bacteria that may be present on food is not the only effect that irradition has
(C)cooking is usually the final step in preparing food for consumption, whereas irradiation serves to ensure a irradiation is
(D) certain kinds of cooking are,in fact, even more destructive of vitamin B1 than the carefully controlled irradiation is
(E) for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded
我不明白E选项是怎weaken结论辐射支持者的观点的，OG解释里说if the effects of radiation and cooking combine to destory more B1 than cooking or irradion alone would,then the
proponents'claim suggests something that is false.这个说法好像和答案E的削弱不一样，OG的这句解释感觉并没有削弱，两者之和本来就比单一的一种cooking 或irradiaton毁坏的B1来的多。请教！！！！作者: piacia 时间: 2011-7-22 21:25
A：说支持者是利益相关者，因而人家的观点misleading，涉及主观攻击；错（如果题目是 or else subjective, since_ 我认为还沾边）；
B：只是把题干里的出了杀菌防腐，还可以破坏营养重述了一遍而已；
C：C是这道题我认为最容易错选的选项，似乎阐述了一个cooking 和 irradiation的区别。但是请注意：
支持者说 irradiation并没有比cooking在破坏营养方面更严重，言下之意，就是对于eventually要cooked的食材，反正都要cooking被破坏，先irradiate一下也无妨。（注意这句话更提示了支持者默认食材都要cooked：“However，this fact is either beside the point, since much irradiated food is eaten raw”）
所以C说cook是最终环节，而irradiate只是为了在货架上存放时间长，并不影响支持者的“反正都要Cook”这个思路；
D 把certain kinds of cooking和carefully controlled irradiation做对比，这个极端并不说明问题；
E；对于irradiate后也要cook的食物，这两个环节Vb减少的影响是叠加的； 所以即使ir<cooking，也不好。故misleading。所以E正确。作者: momohe 时间: 2011-7-24 07:29
Irradiation alone destroys X grams of vitamin B.
Cooking alone destroys Y grams of vitamin B.
When irradiation and cooking are combined, the combined effect would destroy (X + Y) gram of vitamin B, more than the share destroyed by cooking only. In the argument, the assumption is that irradiation ONLY destroys the portion of vitamin B which would be eventually destroyed by cooking.作者: piacia 时间: 2011-7-24 21:33
However,it also lowers the nutritional value of many foods
这句话才是作者的piont
You are right.Your task is to weaken proponent's argument.The author's conclusion sentence is the last sentence.However,it also lowers the nutritional value of many foods is not author's conclusion sentence!作者: gmat740740 时间: 2011-7-26 20:52
和这个题目耗了很久，在看了这么多NN的讨论的基础上，我自己也有了点想法，拿出来和大家分享下。
我们能不能这样理解，proponents 认为irradiation 损坏了A这个营养，而cooking要损害A+B的营养。因为 A小于等于A+B，所以题干中说riiadiation is no worse than cooking。
所以，proponents认为这个菜只要被cooking了，就少不了这A营养流失。
