标题: ~~有没有人可以指点一下OG12的69题啊~~ [打印本页] 作者: 默沫 时间: 2010-6-21 20:42 标题: ~~有没有人可以指点一下OG12的69题啊~~ 69. Scientists have modifi ed feed corn genetically, increasing its resistance to insect pests. Farmers who tried out the genetically modifi ed corn last season applied less insecticide to their corn fi elds and still got yields comparable to those they would have gotten with ordinary corn. Ordinary corn seed, however, costs less, and what these farmers saved on insecticide rarely exceeded their extra costs for seed. Therefore, for most feed-corn farmers, switching to genetically modifi ed seed would be unlikely to increase profi ts. 题目大意是: 基因改良的种子种在地理花费的杀虫剂的钱少能够获得一样的收成但是这个省下来的杀虫剂的钱比买种子花的钱不多于是得到结论是种植这种基因改良的种子不会带来利润的增加
Which of the following would it be most useful to know in order to evaluate the argument? (A) Whether there are insect pests that sometimes reduce feed-corn yields, but against which commonly used insecticides and the genetic modifi cation are equally ineffective (B) Whether the price that farmers receive for feed corn has remained steady over the past few years (C) Whether the insecticides typically used on feed corn tend to be more expensive than insecticides typically used on other crops (D) Whether most of the farmers who tried the genetically modifi ed corn last season applied more insecticide than was actually necessary (E) Whether, for most farmers who plant feed corn, it is their most profi table crop