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.
个人愚见。。。。B里面说了杀虫剂的价格，如果杀虫剂价格非常高的话，那么就算只减少slightly的杀虫剂用量，那么还是可以省很多钱，抵消掉新的农药种子多出来的钱，这样一来对农民来说就是有经济好处的。如果杀虫剂的价格不高的话，那么只减少一点点杀虫剂的用量，这样一来没省多少钱，对农民就没什么经济好处了。回答yes支持no反对，这样一来B还是可以evaluate的，不过那个后面used on other crops真心觉得像无关选项啊........
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发表于 2012-4-26 17:01:34
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