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标题: 求解，这道题，很有难度？ [打印本页]

作者: annyhelijun 时间: 2011-8-13 16:00
标题: 求解，这道题，很有难度？
Plantings of cotton bioenginineered to produce its own insecticide against bollworms,a major cause of crop failure,sustained little bollworm damage until this year.This year the plantings are being seriously damaged by bollworms.Bollworms,however,are not necessarily developing resistance to the cotton's insecticede.Bollworms breed on corn,and last year more corn than usual was planted throughout cotton-frowing regions.So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms
In evaluating the argument,which of the followin gwould it be most useful to establish?
(A)Whether corn could be bioengineered to produce the insecticide
(B)Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year
(C)Whether orher crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
(D)Whether plantings fo bioengineered cotton are frequently damaged by insect pests orher than bollworms
(E)Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticede produced by the bioengineered cotton

作者: sdcar2010 时间: 2011-8-13 20:10
Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year. This year the plantings are being seriously damaged by bollworms (Background facts). Bollworms, however, are not necessarily developing resistance to the cotton’s insecticide (opinion). Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions. So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.

Inevaluating the argument, which of the following would be most useful to establish?

So the conclusion is: It is likely that the cotton is damaged by bollworms breeding on corn. The premises: 1) boll worms breed on corn; and 2) more corn than usual was planted in the cotton-growing regions.

If you look at the argument, it hinges on the assumption that the bollworms eating cotton come from the corn field.

To find the correct answer for an evaluation question, you simply answer Yes or No to the evaluation question, and then see the effects on the conclusion.

B) Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year.

If Yes, then cotton crops are heavily damaged by bollworms. It agrees with the conclusion that bollworms from corn field eat cotton. The conclusion holds.
If No, then we have a problem with the conclusion. If cotton without bio-inseticide does not suffer from unusual damages from bollworm, there might not be HUGE amount of bollworm coming from the corn field. Then the heavy damage to bio-engineered cotton is caused by the bollworm breeding within these bio-engineered cotton. Thus, the conclusion falls apart.

作者: annyhelijun 时间: 2011-8-14 19:57
LZ，能给消息的中文解释么？

作者: anita519 时间: 2012-3-14 19:54
这题其实可以这样理解。cotton有两种不同类型，一种是会产生杀虫剂的，这杀虫剂能杀死b，即文中提到的bioengineered cotton。另一种是不产生能杀死b的杀虫剂的cotton。结论是，因为b吃玉米，所以今年玉米多了，b就多了，cotton们就毁的很严重。
A是说玉米能搞杀虫剂么？无关吧！
B说其他cotton是不是死的很惨？Yes的话，特殊cotton即使b再多都不会死，成了个不变量，而总体的cotton死的很惨，所以如果其他cotton死的惨，结论就成立了。反之No就不成立。
C说其他玉米blahblah……无关
D说特殊cotton会不会被别的害虫吃掉？与结论要探讨的是否因为b的增多而导致cotton死的惨无关
E是说特殊cotton有没产生某种杀虫剂能对付b的？无关

作者: wildmantomba 时间: 2012-3-26 15:37
前提
1.虫子以玉米为生
2.去年的玉米种了很多
结论
1.是因为玉米种了太多，所以有太多的虫子，所以棉花也相应受害

棉花受害的原因的可能性
1.虫子有可能产生了抗药性（Bollworms, however, are not necessarily develooping resistence to the contton's insecticide.）
2.从玉米田里飞来的虫子太多了

如何判断抗药性是否消失呢？
看不具有insecticide的棉花的损失情况而定
1.这种类型的棉花受害程度比往常还要厉害=>除了自身棉花田的虫外，还有外来原因
2.这种类型的棉花受害程度和往常一样=>和往常一样只承受自身棉花田的虫害

A、玉米是否也可用基因工程改造（无关，无法协助判断虫害原因）
B、正确答案，如上所述
C、其他谷物的状况（无关，关注的是棉花）
D、棉花得到其他虫害情况（无关，关注的是bollwarm）
E、是否有杀虫剂可以用来除虫（无关，关注的是抗药性或玉米田来的）

从有关无关选项可以直接判断

作者: alexisqyj 时间: 2012-4-4 10:08
把自己的看法写出来，这道题多想想其实真的挺变态的，OG上解释说有两个原因一个假设其实是这样的，偶觉得应该分三种情况讨论：
题目：因为Bio...ressistence are not necessary 同时发现corn 变多了
所以吃corn 的bollwarm多了
所以cotton少了
结论：是corn多了导致cotton 少了
评价：1) if bio cotton> nonbio cotton, then no bio... ressistence, i.e. bio 起作用了
2) if bio cotton<nonbio cotton, then 有the third reason
3)if bio cotton=nonbio cotton, then 因为corn 多了
所以B选项正确，可以判断到底是三种解释中的哪一个！
想了我好半天呀，觉着如果自己考试遇到这种题肯定没有时间这样想，所以像这种设置对照组的选项（像高中生物实验题一样的）可以优先考虑哦~

作者: zenglh1988 时间: 2012-12-5 13:56
题目中说了bollworms是不会产生对insecticide的抗体，所以根据题目的意思无论是cotton上的还是corn上的bollworms都是不会对bioengineered cotton造成影响。而判断受到的损害是否来自corn-bred bollworms，最好的办法就是看non-bio cotton。因为non-bio cotton每年都会遭受damage，而如果Yes，则今年遭受的damage比以前都要严重，则说明是多种了corn带来了corn-bred bollworms，支持结论；如果No，则说明今年遭受的虫害和往年一样，不是受到了corn-bred bollworms的影响，否定结论，但plantings are serious damaged，则有可能是其他原因（比如说今年non-bio cotton种多了等），但是不需要我们讨论。

作者: zenglh1988 时间: 2012-12-5 14:00

题目中说了bollworms是不会产生对insecticide的抗体，所以根据题目的意思无论是cotton上的还是corn上的bollworms都是不会对bioengineered cotton造成影响。而判断受到的损害是否来自corn-bred bollworms，最好的办法就是看non-bio cotton。因为non-bio cotton每年都会遭受damage，而如果Yes，则今年遭受的damage比以前都要严重，则说明是多种了corn带来了corn-bred bollworms，支持结论；如果No，则说明今年遭受的虫害和往年一样，不是受到了corn-bred bollworms的影响，否定结论，但plantings are serious damaged，则有可能是其他原因（比如说今年non-bio cotton种多了等），但是不需要我们讨论。

-- by 会员 zenglh1988 (2012/12/5 13:56:47)

所以答案是B

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