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
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: Serena11457 时间: 2012-11-29 19:34