gwd1-12有严重不同看法

seriousa

最开始选的D，后来把文章翻译了一遍选了B，最后再仔细比较选择了C。

解题的关键应该是在第二段最后一句，讲MSH火山爆发的直接后果就是straying rate从16%上升到了40%。所以：

首先，B的错误在于“the genetic structure”。原文并没有说the genetic structure到底被影响到什么程度。所以，B错误。

其次，D的错误在于原文并没有讲返巢能力是如何被破坏的。只是说straying上升。所以，D错误。

最后，C的正确性也可以由Although A，B.这样的句型来检验。根据平行原则，A和B应该是同一类。

原句（Although no one has quantified changes in the rate of straying as a result of the disturbances caused by humans, there is no reason to suspect that the effect would be qualitatively different than what was seen in the aftermath of the Mount Saint Helens eruption）的翻译是：虽然没有量化因人类disturbance而带来的straying rate变化，但是没有理由怀疑（这样的数量变化）会与MSH的aftermath（也就是上文提到的从16%到40%）有本质的差别

perpetual

我选的B，不知是否正确。。

作者说，虽然人类活动和火山爆发有数量上的不同，但不应该怀疑其性质上对鱼的影响是一样。

一方面是做比较，反映人类活动的破坏程度。

另一方面，文章第二段首句给出了观点。Large-scale disturbances in one locale also have the potential to alter the genetic structure of populations in neighboring areas, even if those areas have pristine habitats. 说不仅影响受污染的地方，还影响附近干净的地方。这和B的elsewhere 是对应的。

冬之心

guoyun622

坚持选B..作者的目的是在说明人类的活动对鱼有质的影响,但不是说应该要按火山这个标准来衡量.(用什么衡量其实都可以,只要说明问题就可以了).对于D,鱼的HOMING INSTINCT是没有被影响的,鱼的本能没有改变,只是环境迫使他们改变线路了.而且如果要SHOWING HOW,必须给出具体细节是怎么影响的,明显不合.

beichenxuans

绝对是B

首先measure against 的意思是

to judge someone or something by comparing them with another person or thing

Bridget did not think she had to measure herself against some ideal standard.

Measured against our budget last year, $2.7 million seems small. （L字典）

所以说Mount 在这只是提供一个标准的比较的参照物

但是人类活动是比mount少还是多 还是一样  选项没有表达出来 standard只有标准的意思 没有相同的意思

C 选项只说the Mount Saint Helens eruption可以作为Judge人类活动的影响的参照物

正像例句里说的那样 两个物体比较结果可以差很多 也可以一样

而原文用the Mount Saint Helens eruption正是为了说明人类活动影响的大小

C 只提供了比较方法 没说到底大还是小

就像要证明A很大

C说你拿A和B比比

但没说比较结果

硬要说比较结果一样 那是过度reasoning

maggie0406

果然狡猾的RC!!

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

本题有争议,答案是C,但是很多人觉得B对. I USED TO CHOOSE B TOO!但是现在看看,还是C对!

回文中定位! 最后一段. 没人能够定量人类行为造成鱼儿游离的比率,但是这种影响的性质和火山是一样的.所以B是不对的,EXTENT程度应该属于定量了! 而STANDARD的含义the effectwould be qualitatively different than what was seen in theaftermath of the Mount Saint

Helens eruption.

Although no one has quantified

changes in the rate of straying

as a result of the disturbances

caused by humans, there is no

(70)      reason to suspect that the effect

would be qualitatively different

than what was seen in the

aftermath of the Mount Saint

Helens eruption.  Such a dra-

(75)      matic increase in straying from

damaged areas to more pristine

streams results in substantial

gene flow, which can in turn lower

the overall fitness of subsequent

generations.

-- by 会员 superdino (2006/9/3 22:48:00)

同意此观点，而且B中的elsewhere不准确，文中指是说减少了gene flow从而影响了下一代，并没有指出影响其他地方的大马哈鱼的基因结构。

AMBER513

看一下！