Q3:

Scientists have made genetic modifications to cotton to increase its resistance to insect pests.  According to farmers’ reports, 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?

1. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed
2. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops
3. Whether for most farmers who grow cotton it is their primary crop
4. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did
5. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide

哪位好心的大爷给个正确答案吧,是D还是E啊

E。D中谈到的种多少acre的问题在题中已标明pesticide needed per acre,因此在继续谈论how many acres没有意义。

参考xyGWD中某牛人的分析：E选项的意思是因为农民以前在种普通棉花时习惯了不得不用大量的杀虫剂所以在改良的棉花山还是习惯性的用了这么多，如果是，则说明不是改良品种不好，而是使用不当，这些品种可以带来经济效益，原文结论不成立。如果不是，则原文结论成立

哦，看错了，是e

http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=1354869&id=83238&page=1&skin=0&Star=1   

        
T-3-Q3.  老题
            

这题经过诸牛，包括 lawyer的意见，最后选B，不是D也不是E。

我比较赞同B的解释。。。

不过这题好象是逻辑，放错地方了：）