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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 topic of this passage is______.
选项 A、food and health
B、vitamins and proteins
C、meat, vegetables and proteins
D、food and vitamins
答案A
解析 这是一道主旨大意题，问的是这篇文章的主题。选项B和选项C都只谈到了文章的某一方面，属于以偏概全的选项。选项D只涉及了第一段的内容，并非整篇文章的主题，文章谈到了摄人什么食物来获取蛋白质，不能偏食，要摄入各种食物，都是围绕着食物和健康来展开的，因此应该选A。
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