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  3. Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstr

Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstr

admin2018-09-25  58
问题     Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need. It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles. When a fragrant flavor was added to the vitamin-enriched fluid, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time, however, they broke the habit and went back to where the necessary vitamins were.
    In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement, with a wide selection of baby food before them. They were given whatever food they pointed to or appeared interested in, We are told that at first they showed some unusual eating patterns, but that over a period of time they managed to select well-balanced diet.
    So, in selecting food, rats and babies do seem to know and act on what’s best for them. Apparently, there is a kind of "body wisdom", which humans soon lose. Most of us do not eat as wisely as we could. Many of our food preferences are culturally determined and influenced by long-established habits. Some people eat foxes, dogs and blackbirds, while we eat cows and pigs. So what people eat and how much they eat seems to be greatly influenced by what is going on around them.
选项 A、encourage rats to drink vitamin-enriched water
B、find out rats’ preference in flavor
C、test whether rats know which drink is good for them
D、demonstrate that vitamins are tasteless
答案C
解析 答案在文章第一段第二句：“It has been demonstrated that rats will，when given a choice over a period of time，prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles.”(实践证明，如果在一段时间里让老鼠做出选择，它们更喜欢喝含有维他命的水，虽然两者尝起来和闻起来都没有区别。)
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