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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.
不知道此题为何错，求分析，我的思路如下：
【P】W鸟的最爱是worm
【C】Worm数量下降导致W鸟数量下降
题型判断：相关因果
思路：要么同时提及W鸟和Worm，要么给出第三方因素导致W鸟数量下降
A，没有提及W鸟，排除
B，没有提及W鸟数量下降的原因，排除
C，没有提及W鸟，排除
D，许多W鸟在秋天迁移到了其他地方，没有提及W鸟数量是否下降，排除
E，提到了W鸟数量下降比其他鸟数量下降厉害，可能存在其他原因导致了W鸟数量下降，判断方向为CQ4， 存在他因导致W鸟数量下降。
不知道为啥选A，欢迎毕老师批评指正，谢谢
A：不吃budworm但是depend on coffee plantations的另外一种鸟也减少了。说明budworm不是导致减少的原因，削弱了Scott的推理。
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