2. 外语
  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【B1】_____

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【B1】_____

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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【B1】______ 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(香的)【B2】______ was added to the vitamin-enriched water, the rats did seem to prefer it and kept drinking it, even after the vitamins were【B3】______ to the clear water. In time,【B4】______, they broke the habit and went back to where the necessary vitamins were.
    In a【B5】______ experiment, babies of 6 to 12 months old were placed in a cafeteria(自助)feeding 【B6】______, with a wide selection of baby food before them. They were given whatever food they 【B7】______ interested in. At first they showed some【B8】______ eating patterns, but over a period of time they managed to select well-balanced diet.
    【B9】______. Apparently, there is a kind of "body wisdom", which humans soon lose. Most of us do not eat as wisely as we could.【B10】______. Some people eat fox, dog and blackbirds, while we eat cows and pigs.【B11】______
【B3】
选项
答案switched
解析 此处需用被动形式的动词。switch意为“转换，改变”．拼写时不要漏加-ed。
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