[問題]GWD13-Q34~Q37

[mandy-lo]

謝謝david幫忙解答........我再好好研讀....

[pimi]

阿諾~沒人問Q36
The primary purpose of the passage is to
A.describe the development of new techniques that may help to determine the driving force behind population cycles in lepidoptera
B.present evidence that refutes a particular theory about the driving force behind population cycles in lepidoptera
C.present a hypothesis about the driving force behind population cycles in lepidoptera
D.describe the fluctuating patterns of population cycles in lepidoptera
E.question the idea that a single driving force is behind population cycles in lepidoptera

Ans:C

想請問選C的原因是不是因為要證明L的population cycles主要不是被driving force所影響
像一開始懷疑是predatory或是parasites甚至是habitat影響了L的population cycles
但是結果證明不是受predatory或是parasites甚至是habitat影響
所以就覺得不是self-regulating那就是有個agent影響了L的population cycles
之後發現有可能是virus這個agent影響了L的population cycles
但是之後又發現在virus出現前, L的population就已經開始下降了, 所以不是virus引發L的population下降
所以應該就是self regulating影響了population

請問這樣對嗎??? 這篇真的看了霧煞煞@ @

[amazingslim]

我想36題的答案，可以對照第44~47行
Nuclear polyhedrosis viruses
(45)are hypothesized to be the driving
force behind population cycles in
lepidoptera
回應了第25~32行，population circle的driving force就是這個agent(也就是virus)

[dibert8]

我想請問一下GWD-13-Q37:
According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases

A. were not widely prevalent among insect populations generally
B. affected only the caterpillar life stage of lepidoptera
C. were the driving force behind lepidoptera population cycles
D. attacked already declining caterpillar populations
E. infected birds and parasites that prey on various species of lepidoptera

這裡的定位是在L31~39這段嗎？
Recent work suggests that this
agent may be a virus. For many
years, viral disease had been
reported in declining populations
(35) of caterpillars, but population ecolo-
gists had usually considered viral
disease to have contributed to the
decline once it was underway rather
than to have initiated it. The recent….

我當時看到attack就把它給刪了,
因為contribute to不是有”有助於或促進”的意思,
於是我將它解讀成viral disease被看作有助於decline
而D選與我的想法相左,於是就把它給刪了……
>_< 請問這題該怎麼做呢?

細節題,定位正確;考 but 句子裡的 rather than: rather than to have initiated it
(D) already 正好是 initiate 的反義; attack = be underway

[pimi]

我認為本題答案應是A
作者根據改變棲息地並無減少毛毛蟲數量而主張環境不是主因，<<文因導致無文果>>要weaken
(a)提出其它原因<<天敵減少>>導致無文果
(b)hypathesis(theory)不可有例外，所以就算b成立，文章也己經指出一個毛毛蟲數量不會減少的實驗

Dear 小晃兄,

借用魚大大的說明:
由25-30，author認為以下兩種皆不為影響population cycle的主因。
1.The common approach is measuring the mortality caused by different agents, such as predatory birds or parasites
2. another way is to change the caterpillars’ habitat and by reducing caterpillar populations

所以要weaken就對這兩點下手，說明其中任一點是會影響population cycle即可。

-A選項:說明birds與parasites減少=>資訊不足，無法說明如何影響population cycle。
-B選項:新實驗說明環境會影響population cycle喔！(weaken No.2 above)

歡迎討論。

Q34是說line25-30之間的conclusion, 如果講到要改變棲息地, 好像就已經到了line22-23那邊了, 好像有點超出題目要weaken的範圍, 那為何還能選B呢?
請大大明示

[FIG]

如果把Q34，改成CR來問
B選明顯是一個"他因造成文果"的選項 => weaken

至於是否超出範圍，
1.25~30是 "In short" 感覺上整段都算他的
2.如果單看25~30，相信以CR的作法，找出的答案也是B選。我覺得只是碰巧22~23有提到類似的概念