26. 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 rise 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 if 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 higher than in inland areas.
(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.
(E) The fish that guillemots eat are currently preyed on by a wider variety of predators in the
southernmost Arctic regions than they are farther north.作者: alzn2765 时间: 2015-5-31 01:46
A的意思就是直接的削弱。
即使变暖了，北方还会有提前到来的降雪，导致“非降雪”天气不足88天，从而雏无法生存。作者: ccp92 时间: 2016-12-9 09:20
答案是D，我看了您在另一帖子的分析，A应该是无关选项吧作者: 胡茗译 时间: 2016-12-12 16:46
这个题我最开始做的时候也错过，答案应该是D。
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 rise 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 if the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually early snow. A选项所要undermine的是argument中的premise而非assumption，这里涉及的概念就是GMAT CR题中作为事实被引用的论据通常不会被质疑。weaken的题型需要找到并攻击的是从premise到conclusion中隐藏的assumption（gap）并且。
(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 higher than in inland areas.
(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.该选项很直接的说明为什么G鸟要extend northward， 因为southernmost的冰化了，鱼没了，所以鸟要飞到北边找饭吃。
(E) The fish that guillemots eat are currently preyed on by a wider variety of predators in the