GWD-3-38

paopao

Q38:

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?

1. The numbers of the Baltimore oriole, a songbird that dose not eat budworms but is as dependent on South American coffee plantations as is the Tennessee warbler, are declining.


2. The spruce-budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.补充信息，无关
   



3. The drop in the population of the spruce budworm is expected to be only temporary.无关，补充信息
   



4. Many Tennessee warbler have begun migrating in the fall to places other than traditional coffee plantations.无关


5. Although many North American songbirds have declined in numbers, no other species has experienced as great a decline as has the Tennessee warbler.无关比较点

其它选项好排除 可是不明白为何A是答案

A只是讲与TW一样依赖咖啡树的一种鸟下降 因为选项没有将TW与联系起来

所以我感觉也是无关选项

谢谢

paopao

明白了

谢谢mariezhu.