标题: 求助陈向东逻辑书的一道假设题 [打印本页] 作者: yanguowuhen90 时间: 2011-7-15 21:24 标题: 求助陈向东逻辑书的一道假设题 An acre of average farmland produces only about 400 pounds of grain amaranth, as against 2400 pounds per acre, or six times as much, for wheat. It follows that whenever the grain-amaranth price is projected to be more than six times the projected price of wheat, farmers wishing to maximize profits will grow grain amaranth rather than wheat. The argument above is based on which of the following assumptions？ A) An acre's worth of grain amaranth is no more expensive to grow and bring to market than an acre's worth of wheat. B) There is no crop that produces a higher yield in terms of pounds harvested per acre than wheat. C) By choosing which crops to grow, farmers can exert a significant influence on the prices of those crops. D) Farmers are no less motivated by the desire to maximize profits than are other occupational groups. E) Prices of grain crops can change faster than farmers can change the acreage devoted to various grain crops.