标题: GWD的完成题，怎么看呢？ [打印本页] 作者: Xiaotongdi 时间: 2011-4-20 16:29 标题: GWD的完成题，怎么看呢？ Scientists have made genetic modifications to cotton to increase its resistance to insect pests.According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.
Which of the following would it be most useful to know in order to evaluate the argument?
Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed
Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops
Whether for most farmers who grow cotton it is their primary crop
Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did
Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide 这题的答案是D，但是我选了B，我觉得既然和经济有关，那应该涉及到成本啊，那么杀虫剂的成本不是应该很重要么？