GRE短阅读

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Widespread climate change challenges traditional notions that preserving specific chunks of land is
an adequate way to protect endangered species. Commitment to particular places has taken
conservation a long way, but it works only when the climate is relatively stable. When climate
change rather than degraded habitat threatens a species’ survival in a particular location, moving
the species to new locales might become one way of preserving it. Some ecologists argue that
such assisted migration is simply a way to mimic the natural process of dispersal: its adherents
intend to transport species from places that have become uninhabitable through places that
humans have made impassable. Although it has its risks, assisted migration may be a necessary
step in the evolution of conservation.


1. The author of the passage implies that some endangered species are unlikely to migrate
naturally to habitats better suited to their survival because
A. climate change is making such habitats disappear
B. few if any viable routes to such habitats exist
C. the pace of natural migration is typically slower than the current pace of climate change
D. their numbers are already below the thresholds necessary for the typically random processes of
natural dispersal
E. their dependency on their current habitats is too strong


第一题为什么选B？？？“its adherents intend to transport species from places that have become uninhabitable through places that humans have made impassable. ”不是代表保护者想通过impassable的地方把动物迁出吗？为什么变成“unlikely to migrate naturally” ？