In experiments, babies of 6 to 12 months old were placed in a room with many choices 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 habits, but over a period of time they managed to choose a well-balanced diet.

　　So in choosing food, rats and babies do seem to know what's best for them. Clearly, 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 old habits. Some people eat foxes, dogs and blackbirds, while we eat cows and pigs. So what people eat and how much they eat seem to be greatly influenced by what is going around them.

　　55. In the experiment on rats, a sweet smell was added to the rats’ drinking water to ________ .

　　A. encourage rats to drink vitamins-enriched water

　　B. test whether rats know which drink is good for them

　　C. find out rats’ preference in flavor(口味)

　　D. show the vitamins are tasteless

　　56. Talking about eating habits, babies and rats are just like each other because ________ .

　　A. both have the wisdom to choose a balanced diet

　　B. both prefer flavored food and drink

　　C. both have the same eating habits

　　D. both develop a taste for the same kinds of food

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