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 _______.（E）
many of the proponents of irradiation are food distributors who gain from food’s having a longer shelf lifeit is clear that killing bacteria that may be present on food is not the only effect that irradiation hascooking is usually the final step in preparing food for consumption, whereas irradiation serves to ensure a longer shelf life for perishable foodscertain kinds of cooking are, in fact, even more destructive of vitamin B1 than carefully controlled irradiation is for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded不明白原文中的 However, this fact....,中的this 是指代什么？紧接着的句子是支持irradiation,还是反对irradiation? E选项是什么意思啊？[em06][em06]
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