The project required ten years of diligent research．（）
Increasingly over the past ten years, the general population (and especially young people) has become aware of the need to change its eating habits, because much of the food we cat, particularly processed foods, is not good for our health. Conversely, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been grown using chemical fertilizers widely used in farming today.
Natural foods, for example, are vegetables, fruits and grains 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 type of farming is a natural process compared to farming with the use of chemicals and fertilizers, the main purpose of which is to increase the amount——but not the quality——of goods grown in commercial farming areas.
Natural foods als
A. improve their working conditions
B. increase the yields of their crops
C. provide their crops with more vitamins and minerals
D. improve the quality of goods grown in commercial farming areas
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