OG evaluation

real700 · 发表于 2018-11-21 18:47:19

【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。。。

Airmare · 发表于 2018-12-12 22:25:16

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.

real700 · 发表于 2018-12-13 11:59:35

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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