一道填空题。。。。。。。。。

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

答案是e,为什么呢？还望牛牛指点
        

我想是不是从句意上理解？

超级争议题

楼主应该做的是GWD

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