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  3. Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed

Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed

admin2010-04-30  56
问题     Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed food products are now being debated.  Advocates of organic foods — a term whose meaning varies greatly — frequently proclaim that such products are safer and more nutritious than others.
    The growing interest of consumers in the safety and nutritional quality of the typical North American diet is a welcome development. However, much of this interest has been sparked by sweeping claims that the food supply is unsafe or inadequate in meeting nutritional needs. Although most of these claims are not supported by scientific evidence, the preponderance of written material advancing such claims makes it difficult for the general public to separate fact from fiction. As a result, claims that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health have become widely publicized and from the basis for folklore.
    Almost daily the public is besieged by claims for "no aging" diets, new vitamins, and other wonder foods. These are numerous unsubstantiated reports that natural vitamins are superior to synthetic ones, that fertilized eggs are nutritionally superior to unfertilized eggs, that untreated grains are better than fumigated grains, and the like.
    One thing that most organically grown food products seem to have in common is that they cost more than conventionally grown foods. But in many cases consumers are misled if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods. So there is a real cause for concern if consumers, particularly those with limited incomes, distrust the regular food supply and buy only expensive organic foods instead.
The author implies that there is cause for concern if consumers with limited incomes buy organic foods instead of conventionally grown foods because ______.
选项 A、organic foods can be more expensive but are often no better than conventionally grown foods
B、many organic foods are actually less nutritious than similar conventionally grown foods
C、conventionally grown foods are more readily available than organic foods
D、too many farmers will stop using conventional methods to grow food crops
答案A
解析 文意推断题。首先在文中找出相关的细节(文中最后一句)，由“so”信号词不难推出这是一个结论句。原因已在上面陈述过，即“cost more”，“misled if...maintain health and...”恰是其中的两个原因。故A正确：有机肥食物通常造价更昂贵，而且也不比传统培育的食物营养价值高到哪去、
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