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
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。
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.
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
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！！
我的也是EBD。正确答案究竟是什么啊？
e,b,d.
Q1,4都OK,但Q3觉得很难!
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