GWD2－2，4答案到底是什么亚

csvqr

下了好几个不同的版本的答案，自己也晕了

是e，d

还是d，c呢

大家都是对照哪个答案亚

而今迈步从头越

Answer is E, D

dashasha

我也很疑惑，我作的答案是EBD。但是标准答案是DBC。花了半天时间分析，觉得我自己作的是对的。

xinfaxian

第4题不是C 吗？到底是什么呀？可不可以请nn们过来看一下呀？这篇阅读的答案全都混乱的很。

而今迈步从头越

D.

Keystone status appears to depend on          15

context, whether of particular geography or of such factors as community diversity              16

(for example, a reduction in species diversity may thrust more of the remaining species   17

into keystone roles) and length of species interaction (since newly arrived species           18

in particular may dramatically affect ecosystem).

GWD-2-4:

The passage suggests which of the following about the identification of a species as

a keystone species?

A.      Such an identification depends primarily on the species’ relationship to the dominant species.

B.      Such an identification can best be made by removing the species from a particular

ecosystem and observing changes that occur in the ecosystem.

C.      Such an identification is likely to be less reliable as an ecosystem becomes less diverse.

D.     Such an identification seems to depend on various factors within the ecosystem.

E.      Such an identification can best be made by observing predation behavior.

how could you infer that Such an identification is likely to be less reliable as an ecosystem becomes less diverse?

swlfx

呵呵，D 比较好。

amy1949

Question 2:

The primary purpose of the passage is to

A.      point out some of the differences between dominant and keystone species

B.      emphasize the complexity of the interactions that occur between two particular species

C.      detail the effect of a particular habitat on the role occupied by a certain keystone species

D.     illustrate the importance of community diversity for the perpetuation of an ecosystem

E.      explain some considerations involved in determining whether a species occupies a keystone role

为什么答案是D 而不是E

xuyuan200201

支持e,d

第二题的D说的明显是细节性的问题，是不应该作为目的性主题题的答案的！！

luyanzheng

ding

bigtone

我做的时候也选E，D，不过不敢坚持，没把握。现在多了点信心了