gwd1-12有严重不同看法

ptr07

My post is wrong, I mean that

C is correct
D is correct only if the questoin asks the vocano eruption in previous paragraph in order to,

jcjc0602

以下是引用elite-william在2005-6-28 22:11:00的发言：

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

如楼上所说，文章最后是在对比自然的影响和人的影响。那为什么9提不选C 呢？谢谢了

我觉得第九题应该选c，因为第一段说人类的活动不仅造成了马哈鱼数量的减少而且减少了其基因的多样化，然后第二段说large-scale-disturbution also have potential to alter the genetic structure of population.最后一段说人类活动的影响没有自然disturbution的影响大，所以整篇文章不是应该在说二者的对比吗？

jcjc0602

以下是引用wangyu73cn在2005-7-18 17:32:00的发言：

正因为是在文章最后才说得，是细节内容，所以不选C。

应该选E。

我觉得第九题应该选c，因为第一段说人类的活动不仅造成了马哈鱼数量的减少而且减少了其基因的多样化，然后第二段说large-scale-disturbution also have potential to alter the genetic structure of population.最后一段说人类活动的影响没有自然disturbution的影响大，所以整篇文章不是应该在说二者的对比吗？

apoab

1-12我觉得不能选D，原因是D.show how salmons’ homing instinct can be impaired as a result of severe environmental degradation of their natal streams，D说Homing instinct can be impaired,但原文第30行说：
                

Although the (30)   homing instinct of salmon to their natal stream is strong a fraction of the fish returning from the sea   (rarely more than 15 percent) stray and spawn in nearby (35)
                    streams.

salmon的homing instinct指的是它们会从海里回到出生的河流的天性，而举MSH的例子是说large disturbance会影响straying rate 的高低，但不影响home instince的有无，由原文可知salmon的homing instinct并不会变(Although homing instinct~~is strong)，也就是说不管有没有disturbance，salmon一定会从海里回来就对了(差别只在迷路的鱼多还是少)，所以用MSN的例子来说salmons' himing instinct can be impaired是不对的 D错

i3like1105

我觉得选B

B中的extent表程度,所谓程度并不一定非要是定量的数字, 极大极好都叫程度...在原文定位了几个都是表程度的

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 (表程度）
would be qualitatively different
than what was seen in the
aftermath of the Mount Saint
Helens eruption.  Such a dramatic(表程度）
 (75) increase in straying from
damaged areas to more pristine
streams results in substantial(表程度）
gene flow, which can in turn lower
the overall fitness of subsequent
generations.

cyyp

我选的是E,汗。。。不过我认为C的问题也是在这个“standard”上面。

sausau

??????

sausau

文中就是说，虽然无法量化到底人类破坏的程度，但是也不能不怀疑，破坏的程度比火山小
我反正就选b

pinkpinkpink

弱弱问一句the Mount Saint Helens eruption应该是自然的影响啊。B选项中貌似注重的是human activity哦？

B选项确切的意思应该怎么翻啊？？ 

PrinceD

显然选D支持