[問題]GWD27-Q32~Q34

[kaijen]

Q 32 to 34:
Grassland songbirds often nest in
the same grassland-wetland complexes
as waterfowl, particularly in a certain
Line part of those complexes, namely,
(5) upland habitats surrounding wetlands.
Although some wildlife management
procedures directed at waterfowl, such
as habitat enhancement or restoration,
may also benefit songbirds , the impact
(10) of others, especially the control of
waterfowl predators, remains difficult to
predict. For example, most predators
of waterfowl nests prey opportunitistic-
ally on songbird nests, and removing
(15) these predators could directly increase
songbird nesting success. Alterna-
tively, small mammals such as mice
and ground squirrels are important
in the diet of many waterfowl-nest
(20) predators and can themselves be
important predators of songbird
nets. Thus. Removing waterfowl-nest
predators could affect songbird nesting
success through subsequent increases
(25) in small-mammal populations.
In 1995 and 1996, researchers
trapped and removed certain waterfowl-
nest predators. primarily raccoons and
striped skunks, then observed subse-
(30) quent survival rates for songbird nests.
Surprisingly. They observed no sig-
nificant effect on songbird nesting
Success. This may be due to several
Factors. Neither raccoons nor striped
(35) skunks consume ground squirrels,
which are important predators of song-
bird nests. Thus, their removal may
not have led to significant increases
in populations of smaller predators.
(40) Additionally. Both raccoons and striped
skunks prefer wetlands and spend little
time in upland habitats; removing these
species may not have increased the
nesting success of songbirds in the
uplands enough to allow detection.


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Q32
The passage suggests that removing waterfowl-nest predators could possibly have a negative effect on songbird populations because
A. songbird populations could then grow to unsustainable numbers
B. small-mammal population could then move out of the uplands into wetland areas
C. competition among remaining waterfowl-nest predators could decrease significantly
D. a resulting increase in waterfowl populations could crowd out songbird populations
E .a resulting increase in small-mammal populations could increase small-mammal predation on songbirds


answer: E
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Q33
It can be inferred that the habitat preferences of raccoons and striped skunks affected the results of the experiment described in the passage for which of the following reasons?
A. Songbird nests in the wetlands are usually located in places that most waterfowl-nest predators cannot reach.
B. Raccoons and striped skunks are not usually found in areas where songbird nests tend to be located.
C. Mice and ground squirrels tend to avoid predation by raccoons and striped skunks by remaining exclusively in the uplands.
D. The populations of small mammals in the wetlands are usually controlled by larger waterfowl-nest predators such as raccoons and striped skunks.
E. The waterfowl on which raccoons and striped skunks prey in the wetlands compete with songbirds for food.


Answer: B
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Q34
The primary purpose of the passage is to
A. describe some procedures used for wildlife management and consider some problems associated with the execution of those procedures
B. outline a problem related to a wildlife management procedure and offer potential explanations for the results of an experiment bearing on that problem
C. present experimental results that illustrate the need for certain wildlife management procedures and point out some inconsistencies in those results
D. argue that a certain procedure used for wildlife management should be modified because of its unintended consequences.
E. propose that further experiments be performed to assess the long-term effects of certain wildlife management procedures.


Answer:B
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[kaijen]

Q33
It can be inferred that the habitat preferences of raccoons and striped skunks affected the results of the experiment described in the passage for which of the following reasons?
A. Songbird nests in the wetlands are usually located in places that most waterfowl-nest predators cannot reach.
B. Raccoons and striped skunks are not usually found in areas where songbird nests tend to be located.
C. Mice and ground squirrels tend to avoid predation by raccoons and striped skunks by remaining exclusively in the uplands.
D. The populations of small mammals in the wetlands are usually controlled by larger waterfowl-nest predators such as raccoons and striped skunks.
E. The waterfowl on which raccoons and striped skunks prey in the wetlands compete with songbirds for food.


Answer: B

為什麼A不對??
most waterfowl-nest predators 擴大範圍了嗎??

[dibert8]

(40) Additionally. Both raccoons and striped
skunks prefer wetlands and spend little
time in upland habitats

除了 most... 範圍錯誤之外, spend little time =/= cannot reach

這篇文同 GWD25-13~15 http://www.formosamba.com/phpBB3/viewtopic.php?t=23655

[positivegal]

不好意思~可否請大大再解說一下A選項的思路? 不太能理解...
另外B為什麼對呢?
Grassland songbirds often nest in the same grassland-wetland complexes as waterfowl, particularly in a certain part of those complexes, namely, upland habitats surrounding wetlands.
vs.
raccoons and striped skunks prefer wetlands

不是相牴觸的嗎? 還是我根本理解錯了...

[dibert8]

理解應該 OK, 只是 GMAT 考得更細,必須再進一步分析選項的含意.
(天真的美國人,沒有想像中的天真!)

Q33
A. Songbird nests in the wetlands are usually located in places that most waterfowl-nest predators cannot reach.
這是一個佈好的陷阱,經常放在 (A) 選項,細微的差異讓有時間壓力的考生匆忙之下跳進去.
1. most waterfowl-nest predators =/= raccoons and striped skunks 那兩隻動物不能的事,不見得大部份的同類也如此.文章裡只有說 raccoons and striped skunks, 不可據此推論至其它同類.
2. cannot reach 不能到那裡 =/= 不喜歡到那裡 (i.e. prefer wetlands and spend little time in upland habitats = not prefer uplands)

[positivegal]

好邪惡 -__-"

謝謝提醒~ 我以後會特別留意心機重的A選項!