GWD-6-21正确选项如何理解

不好意思,应大家的建议,把全部备选答案贴出来

Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmer's 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 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

为什么D正确,我理解不来,请大家帮忙了....谢谢!

One fact: scientists are making genetic modifications to increase resistance

cause 1: the amount of insecticide was lower for those geneticly modified seed than those original

cause 2: the modifiied seeds cost more and don't have higher market value

Effect: the modified seed isn't beneficial for cotton farmers economically.

If we change the evaluating sentence, we could regard it as an assumption for this reasoning: the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed. If we say yes, the reasoing is accetable. If we say no, the reasoning is undermined for the results from the farmers' report is irrelevant.

“GWD & XDF 是哪本复习材料呢？” 弱弱的问

同意版主MARIEZHU

1。若选D，虽然种的量多了，省的总农药也多，但量多，SEED的总价格也同步升高。还是无法比较那个省钱。

2。如果旧品种用农药多，还贵，则经济上不合算的可能性大。还是用新品种

     如果新品种省点农药，农药却贵，种子也贵，则经济上不合算的可能性大。还是用旧品种

    所以B起EVALUATION的作用

3。选B的缺点是怎莫理解OTHER CROPS，是否指种新品种的庄家。other意思为the second of two, the remaining one of a set. 如果将新旧品种看作一个SET的话，这种理解就对。从行文看，也是将SEED分为MODIFIED 和ORDINARY。所以这种理解是有依据的。

我也认为B正确。

因为衡量是否经济，主要看花的钱，也就是成本是增加还是减少了。

而成本等于单价和用量的乘积。

题目中只说了每英亩的杀虫剂用量减少不大，而B中提到了所用的杀虫剂单价差别。

所以B对。

Ｂ好象有一点道理　可是真的能够把other crop 认定是other kind of Cotton吗？

我怎么读都觉得是COTTON 以外的农作物　例如像是玉米等等　如果是这样的话　那么Ｂ就会变成完全不相关的比较了　所以本选项的关键在于OTHER CROP的定义　真疑惑

事实上我认为是选Ｅ　因为如果使用基因改造的ＣＯＴＴＯＮ　之前是需要更大量的杀虫剂　那就表示基因改造后确实使用量减少很多　也表示这些cotton跟一般的cotton本来的用量就不一样　文章中所说的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比较点不同