请教niuniu~~~ GWD-23-Q14,GWD-28-Q28

pandaeyes

1.         GWD-23-Q14

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.  Bollworms, however, are not necessarily developing resistance to the cotton’s insecticide.  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.

 

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

 

1. Whether corn could be bioengineered to produce the insecticide

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

3. Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them

4. Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms

5. Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton

B  

2.         GWD-28-Q28

Which of the following most logically completes the argument?

A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.

 

A: histidine is found in all parts of the plant – roots, stem, leaves, and flowers

B: the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids

C: others of the closely related group of plants are also found to produce histidine in large quantities

D: cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic（结果的重申）

E: the concentration of histidine in the growing herb declines as the plant approaches maturit

c    

 不太明白....请帮忙解释一下咯...

myronx

两个题目的思路很相似，选项都是说该样本的特点在整个样本空间中是否具有普遍性。

通过比较，如果整个样本空间的单一样本都具有同样的特点，可support关于该特点的结论，如果不是，那么就关于该特点的结论就不一定成立

bipedalism

没明白。我还是选的D

请大家再讨论讨论。

D项至少是描述一个对结论有支持作用的现象。C说得是什么？其他很类似的herb也产生这种氨基酸。能说明什么？好牵强啊！

请NN指点。

热带鱼

D 不对。
因为histidine帮助植物能在重金属土壤中生存，但不一定是通过吸收土壤中的高浓度金属来实现目的的。
也许土壤中的金属离子浓度不变，而histine是使得植物机体本身对高金属浓度具有抗性。

flyuo2006

ding.....