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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.
The main idea of the second paragraph is that______.
选项 A、our health will be harmed if we eat everything
B、all kinds of food should be eaten to keep good balance
C、we should eat all kinds of food but not too little
D、we should eat more of some kinds of food than others
答案B
解析 题干问的是第二段的段落大意。浏览第二段，段落大意很明确，告诉我们要摄人各种各样的食物，如果偏食，身体就会出问题，选项B是同义转述，是正确答案。选项A和选项D都不符合文意，选项C为干扰项，意思是“我们应该吃各种各样的食物，但是别吃太少”，与文意不符。
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