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  3. Today our knowledge of food and what it does for our bodies are far more advanced than that of the old times. Now we know about

Today our knowledge of food and what it does for our bodies are far more advanced than that of the old times. Now we know about

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问题     Today our knowledge of food and what it does for our bodies are far more advanced than that of the old times. Now we know about vitamins and how each kind of vitamin helps in the growth of a particular part of our body. There are on the market all kinds of vitamins which one can take to make up for one’s lack of certain important things, which are needed for good health. Of course, if we eat well and properly, the food that we eat will take care of our body and so there is no need to take any kinds of vitamins unless our doctor tells us that our bodies are short of something, which can be supplied by them.
    Generally speaking, everything we eat does some good to our body. But if we eat too much of one kind of food and pay too little attention to others, we may have too much of one kind and not enough of others. Then we may be in trouble.
    We are often told that we must eat some meat at each meal in order to get the necessary proteins. That is only partly true, for proteins are not found only in meat. We can also get them from some vegetables.
    The best advice about what to eat is that we should eat all kinds of food but never too much of any.
Proteins are found______.
选项 A、only in meat
B、in all kinds of food
C、more in vegetables than in meat
D、in some vegetables as well as in meat
答案D
解析 这是一道事实细节题，根据题干可以定位在第三段的结尾处。蛋白质不仅存在于肉类还存在于蔬菜中，因此正确答案为D。
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