GWD-1-Q9 to GWD-1-Q12: Over the last 150 years, large Stretches of salmon habitat have ...讨论鲑鱼跟环境影响~~ 题目连结: http://www.formosamba.com/viewtopic.php?f=12&t=3409&st=0&sk=t&sd=a 问Q12题答案~~ GWD-1-Q12: The author mentions the “aftermath of the Mount Saint Helens eruption” (lines 73-74) most likely in order to A. provide an example of the process that allows the repopulation of rivers whose indigenous salmon population has become extinct B. indicate the extent to which the disturbance of salmon habitat by human activity in one stream might affect the genetic structure of salmon populations elsewhere C. provide a standard of comparison against which the impact of human activity on the gene flow among salmon populations should be measured D. show how salmons’ homing instinct can be impaired as a result of severe environmental degradation of their natal streams E. show why straying rates in salmon populations remain generally low except when spawning streams suffer severe environmental disturbance 在此想问答案~ 答案给C 但是来欣给的是E~~ @@~ --

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