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  3. Ecologists study how millions of species share the world, rather than take o

Ecologists study how millions of species share the world, rather than take o

游客2025-02-19  45
问题     Ecologists study how millions of species share the world, rather than take on the whole planet at once; they generally focus on a single ecosystem, be it a prairie, a tidal flat, or a sand dune. Even within those limits, they are frustrated by porous frontiers. As a result, ecologists have done some of their most important work on islands, nature’s own isolated laboratories, which may be colonized only a few times over the course of millions of years. On them, ecologists have figured out how the size of a given habitat determine how many species it can support. They have then applied that knowledge to the mainland, showing how fragmented ecosystems become like archipelagoes, where extinctions can strike. [br] In the context in which it appears, “isolated" most nearly means
选项 A、completely uncontaminated
B、somewhat unusual
C、extremely rare
D、relatively inaccessible
E、strictly confined
答案 D
解析 根据文章，isolated岛屿指的是只被占领过几次的地方，因此是”不易进入的”，所以选项D正确。
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