OG19新题，求讨论。

westminster

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
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  答案：D。
  
  
  

kluivert

基因种子----less insecticide ---种子价格更高..但节约insecticide成本 ---》 总成本A= 基因种子成本+ less insecticide
普通种子---more insecticide --- 种子便宜...但insecticide 使用量大---> 总成本B= 普通种子成本+more insecticide

而上面说总成本A 与 总成本B 差不多...来考量用基因种子到底是否增加利润

当然，上面前提已经是两种种子最后的产量是差不多的...也就是说最后的收入是一样的..那我们就只能计算成本...要想有较大利润，相同收入下只能是成本低的利润更大

看看D...基因种子的  insecticide 是否过量...
          不过量...那证明成本没优势，和普通种子一样...结果利润也一样
           过量...那很好，证明使用基因种子其实可以降低成本的，只要使用适量的 insecticide就可以...相应的利润就大了

综上，d可以作为评估标准

westminster

kluivert 发表于 2018-8-24 12:46
基因种子----less insecticide ---种子价格更高..但节约insecticide成本 ---》 总成本A= 基因种子成本+ les ...

谢谢你，很清晰了！看到这几个选项，觉得ABCE都不对，然后D也觉得好不确定。所以，就不是很明白。