|
贴一下songbirds保护的文章，我12号考得时候碰到的，一模一样，三道题分别是13,15,17原题 13-17 GWD25-Q 13 to 15: 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. Although some wildlife management procedures directed at waterfowl, such as habitat enhancement or restoration, may also benefit songbirds, the impact of others, especially the control of waterfowl predators, remains difficult to predict. For example, most predators of waterfowl nests prey opportunistically on songbird nests, and removing these predators could directly increase songbird nesting success. Alternatively, small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest predators and can themselves be important predators of songbird nets. Thus. Removing waterfowl-nest predators could affect songbird nesting success through subsequent increases in small-mammal populations. In 1995 and 1996, researchers trapped and removed certain waterfowl-nest predators, primary raccoons and striped skunks, then observed subsequent survival rates for songbird nests. Surprisingly. They observed no significant effect on songbird nesting success. This may be due to several factors. Neither raccoons nor striped skunks consume ground squirrels, which are important predators of songbird nests. Thus, their removal may not have led to significant increases in populations of smaller predators. 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.
--------------------------------------------------------------------
Q 13: According to the passage, which of the
following is true about the role played
by ground squirrels in the ecology of
grassland-wetland complexes? A. While not important in the diet of
raccoons or striped skunks, ground
squirrels are a significant source
of food for other waterfowl-nest
predators. B. Whereas ground squirrels are
typically important as predators of
songbird nests, their opportunistic
predation on waterfowl nests also
has an observable effect on waterfowl nesting success. C. Although most waterfowl-nest
predators prey on small mammals
such as mice and ground squirrels,
populations of ground squirrels tend
to increase quickly enough to compensate for this level of predation. D. Although ground squirrels have been
known to prey on songbird nests, a larger portion of their diets is usually
provided by predation on waterfowl nests. E. Since larger predators tend to prefer
small mammals to songbird eggs as a food source, a large population of ground squirrels plays an important role in controlling opportunistic
predation on songbird nests. ------------------------------------------------------------------- Q 14: Which of the following best describes
the function of the sentence “Neither raccoons…songbird nests” (lines 34-37)
in the context of the passage as a whole? A. It raises questions about the validity of a
theory described in the first paragraph. B. It points out an oversimplification that is
inherent in the argument presented in
the first paragraph. C. It introduces information that may help
explain the results of the experiment
that are presented earlier in the
paragraph. D. It provides a specific example of the type of data collected in the experiment
described earlier in the paragraph. E. It anticipates a potential objection to the conclusions drawn by the researchers
involved in the experiment described
earlier in the paragraph. -------------------------------------------------------------------Q 15: 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 ------------------------------------------------------------------ Q16:TTGWD27-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 ------------------------------------------------------------------ Q17:TTGWD27-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. ----------------------------------------------------------------- 答案 13 A
14 C
15 B
16 E
17 B
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2008-11-14 09:23:00
楼主
