推 lovekyoko:謝謝 07/14 15:25
※ 引述《lovekyoko (匹茲堡的天空)》之銘言：
: 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: 先刪除BDE
B-根本和題目無關，無法推翻S
D-migration可能是鳥兒為了到別處找蟲吃∴無法推翻S
E-可能是因為鳥兒所依賴的食物數量驟減所以鳥兒跟著驟減∴無法推翻S
step 2: AC誰比較對?
C-C為真也不一定能推翻S，S大可說「所以我沒說錯呀，
等這個暫時性的蟲蟲危機結束後，鳥兒就會變多阿」∴無法推翻S
A-也許S還是可以辯駁這種鳥是因為別的原因數量驟減，不能跟warbler混為一談
但這個選項weaken S論點的力道明顯比C強
(K可以說：如果真的跟棲息地無關，反而是跟食物有關，
那為何不吃這種蟲但卻棲息在此的oriole也變少了?)
step 3: 我覺得是A!! XD
大家gmat加油 :>
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