四级考前训练(6)
Part Ⅱ Reading Comprehension (35 minutes)
Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A),B) ,C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre.
Questions 21 to 25 are based on the following passage:
Increasingly, over the past ten years, people—especially young people—have
become aware of the need to change their eating habits, because much of the food they eat, particularly processed foods, is not good for health. Consequently,there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers widely used in farming today.
Natural foods, for example, are vegetables, fruit and grain which have been
grown in soil that is rich in organic matter.In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount but not the quality of foods grown in commercial farming areas.
Natural foods also include animals which have been allowed to feed and move
freely in healthy pastures. Compare this with what happens in the mass production
of poultry: there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than
rubbish. Chickens kept in this way are not only tasteless as food; but also produce eggs which lack important vitamins.
There are other aspects of healthy eating which are now receiving increasing
attention from experts on diet. Take, for example, the question of sugar. This is
actually a nonessential food! Although a natural alternative, such as honey, can
be used to sweeten food if this necessary, we can in fact do without it. It is
not that sugar is harmful in itself. But it does seem to be additive: the quantity
we use has grown steadily over the last centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is provide us with energy, in the form of calories. There are no vitamins in it, no minerals and nofiber.
It is significant that nowadays fiber is considered to be an important part
of a healthy diet. In white bread, for example ,the fiber has been removed. But
it is present in unrefined flour and of
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