GWD 問題

treewing929

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?

A.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.

B.The spruce-budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.

C.The drop in the population of the spruce budworm is expected to be only temporary.

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

E.Although many North American songbirds have declined in numbers, no other species has experienced as great a decline as has the Tennessee warbler.

答案是 E.
請問其他 species 沒有大影響, 有什麼關係?? 可以 weaken Scott's ?如何理解?

treewing929

是不是其他SPECIES 也吃 BUDWORM, 但只有WARBLER 大減少, 所以WEAKEN?

treewing929

求解, 感謝!!

lxsabrina

这题PREP里面选A。。。。。。。。。。