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?
A. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed.
B. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops.
C. Whether for most farms who grow cotton it is their primary crop
D. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did.
E. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide.
B 选项里面其他crops，有此题没有关系吧
如果后面是modified cotton还能讲得通。。
我觉得B肯定不对，B是典型的无关选项。如果按照我的思维，我觉得E是答案。
是否那帮用新种子的老农平时就爱多喷农药，这个问题是有必要知道的，如果我们要衡量这个经济问题。因为新老种子的经济问题由两个方面决定。一： 新种子贵，二新种子目前来看之比老种子少用一点农药。如果二由问题，结论要推翻。
不知是否解答。
一般evaluate 和explain 的题目由点相似，并且也由assumption相似。
evaluate 和explain的题目经常是假设它成立，对结论由影响。
assuassumption的题目是假设不成立，即取非，对结论由影响。当然，由时候取非取是由题目决定，但基本技术就是，你要假定它们是对或错，然后test。
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