Reading Comprehension
试题详情
文章：
题目：
The passage suggests which of the following about the identification of a species as a keystone species?
选项:
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.
答案:
D
