※ 引述《lovekyoko (匹兹堡的天空)》之铭言： : GWD3-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? : 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. step 1: 先删除BDE B-根本和题目无关，无法推翻S D-migration可能是鸟儿为了到别处找虫吃∴无法推翻S E-可能是因为鸟儿所依赖的食物数量骤减所以鸟儿跟着骤减∴无法推翻S step 2: AC谁比较对? C-C为真也不一定能推翻S，S大可说「所以我没说错呀， 等这个暂时性的虫虫危机结束後，鸟儿就会变多阿」∴无法推翻S A-也许S还是可以辩驳这种鸟是因为别的原因数量骤减，不能跟warbler混为一谈 但这个选项weaken S论点的力道明显比C强 (K可以说：如果真的跟栖息地无关，反而是跟食物有关， 那为何不吃这种虫但却栖息在此的oriole也变少了?) step 3: 我觉得是A!! XD 大家gmat加油 :> --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 124.8.4.110