题目

    Healthy food is a general term (术语) applied to all kinds of food that is considered healthier than the types of food sold in supermarkets. For example, whole grains, dried beans, and corn oil are health food. A narrower classification (分类) of healthy food is natural food. This term is used to distinguish (区分) between types of the same food. Raw honey is a natural sweetener, while refined (提炼的) sugar is not. Fresh fruit is a natural food, but canned fruit, with sugars and other additives (添加剂), is not. The most exact term of all and the narrowest classific世界各大洲径流量，按由多到少排列正确的是 [　　] A．亚洲、南美洲、北美洲、非洲、欧洲、大洋洲 B．亚洲、南美洲、北美洲、欧洲、非洲、大洋洲 C．南美洲、亚洲、北美洲、非洲、大洋洲、欧洲 D．南美洲、欧洲、亚洲、非洲、北美洲、大洋洲