OG-26-OG12第三章的！

87338618

Guillemots are birds of Arctic Regions. They feed on fish that gather beneath thin sheets of floating ice, and they nest on nearby land. Guillemots need 80 consecutive snow-free days in a year to raise their chicks, so until average temperatures in the Arctic began to rice recently, the guillemots' range was limited to the southernmost Arctic coast. Therefore, if the warming continues, the guillemots' range will probably be enlarged by being extended northward along the coast.

Which of the following, if true, most seriously weakens the argument?
A. Even when the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually early snow.
B. If the Arctic warming continues, guillemots' current predators are likely to succeed in extending their own range farther north.
C. Guillemots nest in coastal areas, where temperatures are generally high than inland areas.
D. If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.
E. The fist that guillemots eat are currently preyed on by a wilder variety of predators in the southernmost Arctic regions than they are farther north.
我始终不明白，D很明显是要选的，但是B呢，似乎有其道理？欢迎大家讨论哦O(∩_∩)O

sorcerer

我觉得吧，无论是文章还是题目都没有说明这个鸟的天敌到底住在南边还是北边，这样岂不是就留下了一个逻辑漏洞？
如果说这鸟天敌他住南边，随气候变暖就向北扩张栖息地，好像就会和这文章的鸟一样，一起向北扩张了栖息地，可能就会给这鸟带来威胁。
但是另一方面，如果这鸟的天敌本来就住北边，那可能就不会影响到南边的鸟了吧。

反正我觉得B选项还是存在逻辑漏洞的，没有D这么完美。GMAT考试毕竟不是一个严格的统一划分的考试，很灵活的，题目都要求选最怎样的，其他没选上的不代表就是错的，可能只是没那么完美吧……

87338618

谢谢大N~~
这是个新鲜的解释~有一定道理呵！

lanshichao92

我觉得D选项对应的是Guillemots应该迁徙到北面去而不是文中的扩大到北面去，所以有削弱。B选项说明predator本来就在南面（否则怎么扩张到北方？）本来就存在了，所以对Guillemots的扩张到北方是没有影响的，因为本来就会遭遇到predator

hanlei84921

你很细心额！
确实predator应该原先在南部的。