OGCR 13 47

abc791201064 · 发表于 2013-5-29 20:09:26

47. Certain genetically modified strains of maize produce a powerful natural insecticide. The insecticide occurs
throughout the plant, including its pollen. Maize pollen is dispersed bythe wind and frequently blows onto
milkweed plants that grow near maize fields. Caterpillars of monarch butterfliesfeed exclusively on milkweed
leaves. When these caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they die.
Therefore, by using genetically modified maize, farmers put monarch butterflies at risk.
Which of the following would it be most useful to determine in order to evaluate the argument?
(A) Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides
typically used on maize are
(B) Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants
(C) Whether monarch butterfly caterpillars are activelyfeeding during the part of the growing season when
maize is releasing pollen
(D) Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from
the plant's pollen
(E) Whether any maize-eating insects compete with monarch caterpillars for the leaves of milkweed plants
growing near maize fields

请问这个题目逻辑链是什么呢？

RobinSW · 发表于 2013-5-31 14:01:53

结论是农民通过种植转基因玉米将毛毛虫至于冒死的风险。
结论基于的前提是毛毛虫吃了那些被玉米花粉污染的milkweed leaves。也就是说毛毛虫不吃的话，就不会死。
那么毛毛虫到底有没有吃呢？

评估题可以当假设题来做。前提假设就是毛毛虫会吃，不吃的话就不会冒死的风险。把whether去掉，对答案取非，削弱了结论，这是个很好的例子。

希望对你有帮助

OGCR 13 47

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