GWD-27-Q33

snoopydior

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.

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.

请教为什么C不对呢？错在exclusive吗？请NN指教！

李学子

up

李学子

B选项从哪里能够得到呢？？？

李学子

支持C选项

HANHAOLENGYE

C不对，因为在文章34行有说： Neither raccoons nor striped
skunks consume ground squirrels,  
意思是他们都不吃这些小动物，而C选项说小动物避免被他们吃，这与文章是自相矛盾的。
B是对的，从文章第一句Grassland songbirds often nest in    草原燕雀和水禽一样常常把巢筑在
the same grassland-wetland complexes    草地和沼泽地的混合环境里，特别
as waterfowl, particularly in a certain     是那里周围的丘陵栖息地。
Line part of those complexes, namely,
 upland habitats surrounding wetlands.
着重提出了UPLAND.
文章第40行提到： both raccoons and striped
skunks prefer wetlands and spend little       另外它们都喜欢草地，很少呆在
time in upland habitats;      丘陵栖居地。  
而B选项的意思是 raccoons and striped
skunks 在   Grassland songbirds 筑巢的地方很少能够找到  
符合原文所说，简单就是SONDBIRDS喜欢筑巢在UPLAND包围的环境，而
raccoons and striped skunks 很少呆在UPLAND环境下。所以选B,希望能为大家解疑

sivenhuidao1995

HANHAOLENGYE 发表于 2012-8-1 09:16
C不对，因为在文章34行有说： Neither raccoons nor stripedskunks consume ground squirrels,   意思 ...

同意！