题目内容
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 shown that rats will, when given a choice over a period of time, prefer water with vitamins(维生素) to water without vitamins, even though there is no difference in taste or smell between the two water bottles. When a sweet smell was added to the vitamins-enriched water, the rats did seem to develop a taste for it and kept drinking it, even after the vitamins were changed to the clear water. In time(最后), however, they broke the habit and went back to where the necessary vitamins were.
In experiments, babies of 6 to 12 months old were placed in a room with a wide choice 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 that over a period of time they managed to choose a well-balanced diet.
So in choosing food, rats and babies do seem to know and act on 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 many they eat seem to be greatly influenced by what is going around them.
53. 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. find out rats’ preference in flavor(口味)
C. test whether rats know which drink is good for them
D. show the vitamins are tasteless
54. 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 flavors
55 In the experiment mentioned in the second paragraph, babies were .
A. given many choices of drinks B. given all kinds of baby food
C. placed and fed in a hospital D. trained to select a balanced diet
56. According to the passage, grown-up people’s eating habits differ from those of babies in that _______ .
A. they know better than babies what kinds of food are good for their health
B. they usually cannot say no to all kinds of delicious foods
C. their eating habits have much to do with the social and cultural customs (文化习俗)
D. they have more choices of food than babies in eating patterns
CABC
