请教大家T-3-Q3.

ric_ye

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.

我选了D, 答案是B

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.

用在modified seed 的insectile只是比没modified seed的用量小一点点. 那么我觉得,如果你大量生产的话,小就会边多,到时候就可以多省钱啦

qindan

题干说了“per acre ”，所以我估计since the modified seed costs more than ordinary seed without producing yields of higher market value这里的yield也是per acre条件下的结论

因此无论acre多少，都是损失的

[此贴子已经被作者于2008-8-14 11:24:19编辑过]

remona9t

哪个NN再给解释一下为什么选B?

我也选的D

我怎么觉得B无关呢？