T-3-Q3.

Scientists have made genetic modifications to cotton to increase its

resistance to insect pests. According to farmers’ report, the amount of

insecticide needed per acre to control insect pests was only slightly lower

for those who tried the modified seed than for those who did not.

Therefore, since the modified seed costs more than ordinary seed without

producing yields of higher market value, switching to the modified seed

would be unlikely to benefit most cotton farmers economically.

Which of the following would it be most useful to know in order to evaluate

the argument?

A.      Whether farmers who tried the modified cotton seed had ever tried

growing other crops from genetically modified seed.

B.      Whether the insecticides typically used on ordinary cotton tend to

be more expensive than insecticides typically used on other crops.

C.      Whether for most farms who grow cotton it is their primary crop

D.      Whether the farmers who have tried the modified seed planted as

many acres of cotton, on average, as farmers using the ordinary seed did.

E.       Whether most of the farmers who tried the modified seed did so

because they had previously had to use exceptionally large quantities of

insecticide.

如果以前有讨论过了麻烦给我一个连接吧~~~

大部分人在B、E间争论激烈。拥D的大概有六分之一吧。这道题的确黑人憎。但

是B确实好像有道理，棉花杀虫剂横向比较较贵的话，节约一点点都可行啊，比如一

毫升就贵10刀的话，节约1000毫升省不少银子呢。D有点推得远了，把农药扩展到种

植面积，的确牵强了。E呢，说看农民用新品的原因是否是因为过去要使用大量的杀

虫剂。根据题意，好像使用新品的量并没有减少多少啊