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  3. An Interesting Phenomenon Animals seem to have the sense to eat when they are hungry and they do not eat more than their bod

An Interesting Phenomenon Animals seem to have the sense to eat when they are hungry and they do not eat more than their bod

admin2012-07-30  38
问题                       An Interesting Phenomenon
    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 fox, dog 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.
According to the passage, adults eating habits differ from those of babies because
选项 A、adults know better than babies what kind of food are good for their health
B、adults usually cannot resist the temptation of various delicious foods
C、adults’ eating habits are closely related to the social and cultural customs
D、adults have more choices of food than babies in eating patterns
答案C
解析 根据文章第二段最后一句：Babies managed to select well-balanced diet．又根据文章的第三段第四句：Many of our food preferences are culturally determined and influenced by long—established habits．由此可知成年人和婴儿的饮食习惯的不同点在于：成年人的饮食习惯和他们的社会和文化习俗有关。所以选C。
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