Today our knowledge of food and what it does for our bodies is far more advanced than that of the ancients. Now we know about vitamins and how each kind of vitamin helps in the growth of a particular part of our bodies. There are on the market all kinds of vitamin pills which one can take to make up for one’s lack of certain important things which are needed for normal health. Of course, if we eat well and properly, the food that we eat will take care of our bodies without these pills and so there no need to take any kinds of vitamin pills 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 bodies, but if we eat too much of one kind of food and pay no attention to others, we may have too much of one kind of chemical substances 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 protein. That is only partly true, for proteins are not only found 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. 41. According to the passage, we now know _______________. A. more and more about food and health B. what food is fit to eat C. how many kinds of vitamins there are D. more about the growth of our bodies 42. People take certain vitamin pills when they ______________. A. find their bodies are short of something B. want to eat well and properly C. want to cure some diseases D. think certain foods don’t agree with them 43. The writer thinks we should _____________. A. be careful in choosing food B. eat special food B. have limited food D. have balanced food 44. According to the passage, to get proteins, we must eat _________. A. more meat B. only vegetables C. both meat and vegetables D. food and vitamin pills 45. The main topic of the passage is ____________. A. food and health B. vitamins and proteins C. meat, vegetables and proteins D. food and vitamin pills