[单项选择]不属于静态投资的是（）。
A. 涨价预备费
B. 基本预备费
C. 建筑安装工程费
D. 设备购置费

阅读《都江堰》中的一段文字：
它的水流不像万里长城那样突兀在外，而是细细浸润、节节延伸，延伸的距离并不比长城短。长城的文明是一种僵硬的雕塑，它的文明是一种灵动的生活。长城摆出一副老资格等待人们的修缮，它却卑处一隅，像一位绝不炫耀、毫无所求的乡间母亲，只知贡献。一查履历，长城还只是它的后辈。
请回答：

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