试题出自试卷《00596《英语阅读（二）》真题及参考答案（2019.04）》

Many people believe that taking vitamin supplements is the best safeguard against the dangers of an incomplete diet, but this should be a last resort rather than a way out of a problem. Even if there is a genuine need for extra vitamins, then sooner or later the question arises “which ones do I need, how much of them, and how often?” There is really no simple answer to this question. The Food Standards Committee suggests in their recent report to the government that we do not need any extra vitamins. They say that they are “not necessary for a healthy individual eating a normal diet”. Whilst few of us would challenge their authority on the subject of nutrition, it is, perhaps, pertinent to ask the question “how many of us are healthy, and what is a normal diet?” There is an element of doubt in many minds about these two aspects and though few people are familiar with the wording of the Food Standards Report they do wonder instinctively if they are eating the right things. The blame for faulty eating habits is often placed at the door of the ubiquitous junk and convenience foods. As we have seen, some of these are not the criminals they are made out to be. White bread is only slightly less nutritious than brown bread and frozen vegetables can be almost as “fresh” as fresh food. There are very few foods which can really be described as pure rubbish. Many pre-packed foods contain too much sugar and we would all benefit by avoiding these, but most tinned, processed and dried foods contain useful amounts of fat, protein, carbohydrate, vitamins and minerals. The addition of a small amount of fruit or a side salad to convenience foods such as pizzas or hamburgers can turn a snack into a well-balanced meal.
“Junk” food is difficult to define. White sugar is probably the nearest contender for the title. It contains plenty of calories for energy but not much else, and is often described as an “empty calorie” food. Alcohol is also high in calories, but beer and wine contain some of the B vitamins and wine is a good source of iron, so even a teetotaler could not describe all alcohol as useless, nutritionally speaking. Calories measure the energy we derive from the food we eat, and sugar and alcohol are sometimes described as having a high energy density. There is a limit to the amount of energy we need each day (2,000-2,200 calories is the average for women and 2,500~3,000 for men) and if we eat too much sugar and alcohol there is no appetite left for the vitamin-rich foods we need—fish, meat, fruit and vegetables. Buying vitamins can be predicted by psychological as well as nutritional motives and it is prudent to investigate why we think we need them and what benefits we expect from them before we rush off to the health shop to make our purchases.
1. According to the Food Standards Committee, _______.
2. Canned foods do not necessarily mean unhealthy because they may contain _______.
3. We can learn from Paragraph 2 that _______.
4. The word “teetotaler'' in Paragraph 2 means _______.
5. The passage tells us that _______.