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  3. Increasingly over the past ten years, people—especially young people—have become aware of the need to change their eating habits

Increasingly over the past ten years, people—especially young people—have become aware of the need to change their eating habits

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问题    Increasingly over the past ten years, people—especially young people—have become aware of the need to change their eating habits, because much of the food they eat, particularly processed foods, is not good for health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers widely used in farming today.
   Natural foods, for example, include vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount—but not the quality—of foods grown in commercial farming areas.
   Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food: they also produce eggs which lack important vitamins.
   It is significant that nowadays fiber is considered to be an important part of a healthy diet. In white bread, for example, the fiber has been removed. But it is present in unrefined flour and of course in vegetables. It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables, certain diseases are comparatively rare. Hence the emphasis places on the eating of whole meal bread and more vegetables by modern experts on "healthy eating".
People have become more interested in natural foods because______.
选项 A、they like changing their diet from time to time
B、they want to eat food that is more delicious
C、much of the food they eat is no longer considered to be healthy
D、they want to be fashionable
答案C
解析 根据题意可定位至第一段第二句“Consequently，there has been a growing interest in natural foods…”，从逻辑上来看，consequently连接的两个句子之间是因果关系。因此本题询问原因的答案应该在consequently前的句子中。由前一句“…because much of the food they eat，particularly processed foods，is not good for health．”可知，应选C。
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