GWD5-Q30: 看了很久还是木有懂，求高人解答。。。。。。

Sophin

GWD5-Q30:

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 _______.

1. many of the proponents of irradiation are food distributors who gain from food’s having a longer shelf life
   
   
2. it is clear that killing bacteria that may be present on food is not the only effect that irradiation has
   
   
3. cooking is usually the final step in preparing food for consumption, whereas irradiation serves to ensure a longer shelf life for perishable foods
   
   
4. certain kinds of cooking are, in fact, even more destructive of vitamin B1 than carefully controlled irradiation is
   
   
5. for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded
   
   

lusun23

Is 3 the correct answer?

sdcar2010

4 is the answer.

febqq1986

lz公布下答案
我觉得是1啊

febqq1986

晕死，贴子不能编辑
重新看了两遍，觉得答案是5
最后结论分成两部分，先说之前的说法是离题的，因为很多食物是生吃，根本不用cook，之后说这个说法也有可能是误导的，那么这里要选的选项应该要和之前离题那边的原因相关，所以还是5最合适，即使cook了，也不能说B1的流失更多是cook的原因

sdcar2010

I took it back.

5 is the answer.

lonelyorchid

答案必然是E

A、irradiation与是否cook，与食物能够储藏多久根本没有关系
B、irradiation除了在杀菌方面以外有否其他影响与原文无关，因为根本就没有涉及到Cook（原文要比较的是irradiation与Cook）
C、cook和irradiation在食品贮存加工环节所处的位置差异和这两种放法是否破坏食物营养没直接关系
D、说反了，结果变成irradiation更好
E、正确。如果食物生食，则根本不需要cook，没有营养损失，但如果irradiation则会产生营养损失。如果食物不能生食，本身cook就会产生营养损失，如果irradiation则会产生更多的营养损失。

zhaojungao

该题为OG12 #99，可以看看官方的解释