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题库 / Prep2008E2-CR-92
Kate: The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.
Scott: The population of the spruce budworm, the warbler's favorite prey in North America, has been dropping. This is a more likely explanation of the warbler's decline.
Which of the following, if true, most seriously calls Scott's hypothesis into question?
The numbers of the Baltimore oriole, a songbird that does not eat budworms but is as dependent on South American coffee plantations as is the Tennessee warbler, are declining.
The spruce budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.
The drop in the population of the spruce budworm is expected to be only temporary.
Many Tennessee warblers have begun migrating in the fall to places other than traditional coffee plantations.
Although many North American songbirds have declined in numbers, no other species has experienced as great a decline as has the Tennessee warbler.
A: this statement is direct evidence against the idea that budworms are the source of the problem, since it provides an example of a species that doesn't eat budworms but has experienced exactly the same decline.
所以说你的意思是这样的题目论证方式有两个，一个是对S的结论的削弱，或是对于K结论的加强？
A答案既是对S的削弱又是对K的加强，不过做题的时候肯定是当然考虑削弱S啊，并且削弱S和加强K并不矛盾…
是的，我同意不矛盾，我的意思是是否可以通过对对方的削弱判断这个答案可以增强本方？
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