单选题 One of the most effective vegetable protein ______ is the soybean which can be used to manufacture imitation meat products.
A. components B. ingredients C. substitutes D. elements

【正确答案】 C
【答案解析】substitute替代品，代替物。ingredient成分，(尤指烹饪)原料。component部件，组件。element基础；元素。本题采用排除法，只有C项代入原句成立。