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标题: OG evaluation [打印本页]

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作者: real700    时间: 2018-11-21 18:47
标题: OG evaluation

【OG19-P537-632题】

Scientists have modified feed corn genetically, increasing its resistance to insect pests. Farmers 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 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 modified corn last season applied more insecticide than was actually necessary
  
  
  
• E
  
  Whether, for most farmers who plant feed corn, it is their most profitable crop
  
  
  请问各位大神 B 怎么解释呢？D可以理解 但是B 无法排除
  
  
  我认为现在讨论的是 种子的节约成本 和  杀虫剂节约成本之间的比较
  B说农民获得种子的价格会不会稳定  如果普通种子价格上升下降不稳定 都会影响 普通种子与转基因种子间的成本差价啊？也是个可变成本啊？  B 在针对种子成本  而d是杀虫剂的成本。。。
  
  
  

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作者: Airmare    时间: 2018-12-12 22:25
非大神，路过回答一下供参考：
Argument: Corn farmer will NOT make profit from the switch ( From Ordinary to Modified corn)
Standard for evaluation: If I'm the f-corn farmer, will I make profit from the change ???

B）Whether the price that farmers receive for feed corn has remained steady over the past few years
Analysis：I don’t care about the Price since its the same for both Ordinary and Modified Corn, and they have the same yields, so what really matters is the COST to determine the Profit.  

D）Whether most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary  
Analysis: If I'm the farmer who used the modified corn: since last year I wasted too much unnecessary money on pesticide, then in the future, I would SAVE MORE on the COST . Here we got the Profit.

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作者: real700    时间: 2018-12-13 11:59

Airmare 发表于 2018-12-12 22:25
非大神，路过回答一下供参考：
Argument: Corn farmer will NOT make profit from the switch ( From Ordin ...

好的！！ 谢谢战友!! 现在再看 有了新的体会 切身带入一下 更好理解

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