gwd-1-Q9 to Q12 wangyu gg你在吗

vivianwsp198

我想第9题选B的可能基于第一段的最后几句话吧（如下）

 Indeed, most

analysts believe that some kind

of environmental degradation

underlies the demise of many

extinct salmon populations.

 (20)      Although some rivers have

       been recolonized, the unique

       genes of the original populations

have been lost.

但最后一段（如下）说明了人的影响和环境的影响对鱼都是一样的，所以第9题我选了C

  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.

当当84

奇怪，我这里的答案，第9题是E，怎么变成了B,到底是什么？

还有对于e选项

E. describe how environmental degradation can cause changes in salmon populations that extend beyond a numerical   reduction
            

文章前两段都还能解释，那么最后一段哪？我觉得最后一段相当于一个总结段，提出其实人类对鱼的影响和环境的影响是差不多的，那么不就相当于转回来了吗？

谁能帮帮忙？？谢谢

当当84

以下是引用Ville在2006-7-26 12:55:00的发言：

可是7~9只是说了There are fewer salmon in degraded regions than in pristine ones.没有说明decline这个现象呀？

是不是有些不准确？

同意，我也觉得11题的定位有点问题，在文章最后一段，说了，人对鱼的影响和环境对鱼的影响是一样的，那么这里说了，会影响鱼类对于环境的适应能力和E选项一样的意思

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.

Q11:

According to the passage, human activity has had which of the following effects on salmon populations?

1. An increase in the size of salmon populations in some previously polluted rivers
2. A decline in the number of salmon in some rivers

3. A decrease in the number straying salmon in some rivers
4. A decrease in the gene flow between salmon populations that spawn in polluted streams and populations that spawn in pristine streams
5. A decline in the vulnerability of some salmon populations to the effects of naturally occurring habitat destruction

疑惑，不知道怎么解释？

lovelyvans

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.

我觉得11题的B应该是从这里定位找答案，它指出了qualitatively different~~~~另外E应该是错误选项，文中没讨论vulnerability的概念

[此贴子已经被作者于2006-8-8 16:48:45编辑过]

Dinaxie

第9题答案究竟是什么阿？看了半天的说

happylifelin

ding!

ecochem

第9题答案应该是E

janet_wei

支持E

晴天小狗

12.The author mentions the “aftermath of the Mount Saint Helens eruption” (lines 73-74) most likely in order to

 

A：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

B：provide a standard of comparison against which the impact of human activity on the gene flow among salmon populations should be measured

哪个？？

[此贴子已经被作者于2006-10-24 21:47:49编辑过]

晴天小狗

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.

这里是证明disturbances are caused by humans? 其他地方好像没说他们之间的联系

C？？