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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  49
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.
The expression "the habit" (para. 1, sentence 4) refers to drinking water which
选项 A、has no smell
B、is tasteless
C、has vitamins
D、is flavored
答案D
解析 因为第一段的最后谈到：“老鼠不停地喝有香味的含有维生素的液体，即使是维生素被换到了清水里面。然而，很快他就改变了这个习惯，重新开始喝有维生素的水了。”所以句 子中habit实际上指前面的喝有香味的水，所以D项正确。
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