GWD1-Q9

暗绯莎

GWD-1-Q9:

The primary purpose of the passage is to

1. argue against a conventional explanation for the extinction of certain salmon populations and suggest an alternative
   
   
2. correct a common misunderstanding about the behavior of salmon in response to environmental degradation caused by human activity
   
   
3. compare the effects of human activity on salmon populations with the effects of natural disturbances on salmon populations
   
   
4. differentiate the particular effects of various human activities on salmon habitats
   
   
5. describe how environmental degradation can cause changes in salmon populations that extend beyond a numerical reduction
   
   

The numerical effect isobvious:there are fewer salmonin degraded regions than in pristine ones; however, habitat lossalso has the potential to reducegeneticdiversity.Indeed, mostanalysts believe that some kindof environmental degradation underlies the demise of many extinct salmon populations.

注意extend beyond和主题句中的however, reduce genetic diversity


这是CD上的解释，但是文章里明明说到人类的作用的，为什么正确答案选项里没有。。。另外，我觉得是C，能不能帮忙分析一下为什么错？

顺便问一下，为什么下到的CD22套答案和GWD-RC解题里的答案都不一样？应该相信哪个？？

hsinq

虽然这是3月初的问题，希望对LZ有点帮助，NN们请指正
我个人是觉得这里的environmental degradation其实主要来源于human activity&environment disturbance(如volcanic
eruption)，这样的话就有概括到human activity了。

lovepiao

虽然这是3月初的问题，希望对LZ有点帮助，NN们请指正
我个人是觉得这里的environmental degradation其实主要来源于human activity&environment disturbance(如volcanic
eruption)，这样的话就有概括到human activity了。

-- by 会员 hsinq (2010/4/27 21:08:27)

赞个~一下子点透我！谢谢hsinq(*^__^*)

jbc88

弱弱地问句A错在哪了？