标题: OG12 CR 求教69 觉得OG的解释很难理解 [打印本页] 作者: mursili 时间: 2011-8-4 19:13 标题: OG12 CR 求教69 觉得OG的解释很难理解 Scientists have modified feed corn genetically, increasing its resistance to in sect pests. Farmer who tried out the genetically modified corn last season applied less insecticide to their corn fields 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 modified seed would be unlikely to increase profits.
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 modification are equally ineffecitve B) Whether the price that framers 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 famers who tried the genetically modified corn last season applied more insecticide than was actually necessary E) Whether, for most famers who plant feed corn, it is their most profitable crop
请各位大神帮忙解答下。我看这个答案看了起码一个小时了,还是觉得好难理解啊。作者: weijiejing 时间: 2011-8-4 19:58
Farmer who tried out the genetically modified corn last season applied less insecticide to their corn fields and still got yields comparable to those they would have gotten with ordinary corn.关键要注意这句话中的less insecticide
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 是否存在一些虫子有时候是会减少谷物产量的,而且能抵抗普通常用的杀虫剂和那些基因修饰谷物(即基因修饰谷物也对害虫不起作用)?作者: yanjin19891008 时间: 2012-4-4 17:10
这样的话d选项就是加强了文章的结论,对吗?怎么觉的og的解释是说削弱了文章的结论,就是用新作物更合算呢?我也被这题搞得头疼!!!作者: nancy爱草莓 时间: 2012-7-22 20:57
我觉得吧是这样的,应该参考逻辑推理的预设性。举个例子,小明没有看到最后一场压轴大戏。预设就是小明看了比赛。但如果原因是小明肚子疼所以没去,则预设就被撤消了。这个题就是个撤销预设的题。 转基因成本>普通种子成本--------所以转基因盈利少。 根据题设也应该知道共同预设是产量一样。所以只需要打破预设即可。选项D,说去年转基因用的杀虫剂多于正常量,则有可能造成过犹不及的后果,即其实是减产了,打破了产量一样的预设,为这个题开拓了一个新的可能,就是虽然转基因成本高(事实),但是产量可以高,所以也有可能盈利多。作者: 风静静 时间: 2012-8-11 20:57
给了我很大的启发~~thanks~
谢谢很大启发。
原文 Farmers who tried out the genetically modified corn last season applied less insecticide to their corn fields (maybe than to 用在普通玉米上的) and 。。。
答案:Whether most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary--指的是用在转基因玉米上的。
转基因只要用5升农药,普通需要30升,农民用了20升给转基因。这样解释行得通吗?作者: lbr2453076 时间: 2013-8-23 17:20
10楼正解啊!作者: tyd727 时间: 2013-9-21 16:40