天山7-21 讨论

yogaII

天山7套的21题, 题目如下.

普遍的答案都选B, 我认为选E.
题目所说, 一种改良的种子, 一种普通种子. 用改良的种子的人用杀虫剂仅比用普通种子的人少一点. 而改良种子比普通种子贵不少.
鉴于改良种子和普通种子产量相当, 改用新种子并没有太大经济价值.
问以下可以用来评价该命题.
B是无关项, 比较棉花和其他作物?
E说 是否改用改良种子的人以前不得不用非常大量的杀虫剂. 回答该问题就有提供了一个比较项,
A: 现在用特殊种子的, B: 现在仍然用普通种子的.
那就是大家都用普通种子时, A不得不比B用多的多的杀虫剂, 而现在, A却和B用相当的杀虫剂, 那么显然新种子是有价值的.
如果大家都用普通种子, A和B用一样多的杀虫剂, 则说明新种子无价值.
 
请各位指教.


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 farmers 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