gwd1 10,12 迷惑

香香茶

此题尚无定论啊，都讨论两年了。

要等到2007年再来看啦~

mejor

就选B了，第一感觉很重要。不过要过分扣字眼了，阅读还是最好强调总体感觉比较好。

maggie1202

I hold for C, because C stress on "impact", while B focuses on "extent of disturbance". Obviously, the author give the eruption example to discuss what it brought about, not its activity(strong eruption or weak eruption). Please take time to taste the difference.

Waiting for comments from NN!

dreaminger

文章最后一段：人类的侵扰和大自然的改变对结论不会有太大出入。最后一句话：用大自然中火山爆发影响基因的例子来说明，人类的侵扰会造成相似的后果。所以答案C正确。

vivianwsp198

第10题

Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism
            by which a location can be repopulated should the fish there disappear。
            

（D）an environmentally degraded stream could be recolonized by new salmon populations should the stream recover。

有谁解释一下这两句话，第一个SHOULD我明白表示IF，即原本鱼都消失了

那D中SHOULD如何解释，它后面跟的是RECOVER与DISAPPEAR正好相反，不会再是IF的意思吧？

caterpillarcn

12。文章的整个第三段都在重复C选项，毫无疑问的C嘛。

linda816

应该是C，这里的qualitatively正好就和选项中的standard..measure对应,而且gene flow是最后一段的重点描述。我也在B，C之间犹豫过，但是基于在原文中找原词，同义词的原则，我觉得C更合理。

luluQ

Q10:

My answer: D

Look for info fr the text:

Low levels of straying

are crucial, since the process

provides a source of novel

genes and a mechanism

by which a location can be

(40) repopulated should the fish

there disappear.

alohame

这个题考试中出现过么？ETS也觉得题出的别扭不要了吧

zxz1818

Q.10 I believe B is the best answer. When the stray rate is high,

(41) Yet high rates

of straying can be problematic

because misdirected fish may

interbreed with the existing stock

(45) to such a degree that any local

adaptations that are present

become diluted. (means that low rate won't be diluted)

Yes, the degraded stream could be repopulated, but not RECOLONIZED by NEW population. When you use colonize, it means the subject is not from local, however, the salmon is come from local.