gwd1-12这句话是什么意思啊

kevinjpcn · 发表于 2013-6-17 22:25:53

The author mentions the "aftermath of the Mount Saint Helens eruption" most likely in order to

Aprovide an example of the process that allows the repopulation of rivers whose indigenous salmon population has become extinct
Bindicate the extent to which the disturbance of salmon habitat by human activity in one stream might affect the genetic structure of salmon populations elsewhere
Cprovide a standard of comparison against which the impact of human activity on the gene flow among salmon populations should be measured
Dshow how salmons' homing instinct can be impaired as a result of severe environmental degradation of their natal streams
Eshow why straying rates in salmon populations remain generally low except when spawning streams suffer severe environmental disturbance

其中的C选项的which指代什么啊？怎么翻译啊

麻烦大牛指点一下啊

kevinjpcn · 发表于 2013-6-17 22:32:24

发错了。本来想发到阅读区地，不好意思

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