请问songbird哪一题，jj的，thanks

tylergu

请问songbird哪一题，jj的，thanks

Q 13 to 15: songbirds筑巢

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 opportunistic-

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. primary 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.

 

-------------------------------------------------------------------------------------------------------

Q 13:

NOTE: You must scroll to read the answer
        choices for this question.

 

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 water-
        fowl 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.

Answer:

答案是A，

small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest (20) predators

and

Neither raccoons nor striped (35) skunks consume ground squirrels,

D为什么错，wf-predator主要吃wf，然后吃songbird

most predators of waterfowl nests prey opportunistically on songbird nests, （难道是most predator可能不包括ground squireel？）

--------------------------------------------------------------------------------------

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

答案是B还是D， 个人感觉B对，D是迷惑选项吗？

lewton

14题,不包括啊

small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest predators ,说明ground squirrels 是waterfowl-nest predators的食物啊,这里的食物链是waterfowl-nest  predators吃ground squirrels和songbird,同时ground squirrels也吃songbird

tylergu

got it

thanks