GWD6-21， 请继续讨论一下，晕

graceguo98

我也觉得E对，但是答案D

我认为评价问题应该涉及到两个元素--一个变异的种子，一个是杀虫剂，原为说明新种子省一点杀虫剂，但是如果使用大量的杀虫剂的农民，采用新种子从经济角度就省钱了呢。

是不是重点评估这个新种子是不是有经济效益--那就看是不是给棉农省钱啊？

不理解为什么D对？

我在国外的网站也找到了一个解释E的，仅供参考。

Scientists have made genetic modifications[MSOffice1]  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?

 

1. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed
2. Whether[MSOffice2]  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

 

IMO In evaluate the argument questions look for a answer choice which when answered positively strengthens/weakens the conclusion and when answered negatively does the vice versa.

Choice A,B,C are unrleated to the argument(conclsuion).

Choice D looks tempting but if u answer yes and no it does not affect the conclusion both ways.


Choice E does this.

The conclusion is 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.

If the answer to the question for choice E is yes then it means the farmers switched to the modified seeds only bevcause they had to use large quantities of insecticides that would have costed them more(if not ther is no reason to switch)

If the answer to the question for choice E is no then it means the farmers had no good reason to switch and the the argument that modified seeds are not economically benefiicial to the farmers stands.

谢谢

laipiyu

同意E。这里的逻辑是：能不能带来效益应该是用之前和用之后进行比较，因为背景条件一致，唯一区别是采用了新的种子，具有可比性；不应该是用和没有用进行比较，其他背景条件不一定一致，无法比较。

对于D，单位面积不能带来更多profit的话，再多的种植面积也没有用啦。