在GRE的逻辑单题中，有这么一种奇葩题型。这种题没有特殊的解题方法，不过是其他题型的变体。这就是logic completion题
为什么这么说此题是伪装和幌子，来看几个例子。
尽管小明每天都在吃减肥餐，但他体重仍然涨了20斤。这是因为________。（解释题）
张三是共产党员，而共产党员都要参加抗洪抢险，所以_____________。 （推理题）
小明每天都在锻炼，所以他一定能减肥成功的，这是因为___________。（加强题）
小明每天都在锻炼，但是这并不意味这他能减肥成功，这是因为__________。（削弱题）
所以说，文本所呈现的论证结构决定着这种题的本质。而和问法无关。
看例题。
Observations of the Arctic reveal that the Arctic Ocean is covered by less ice each summer than the previous summer. If this warming trend continues, within 50 years the Arctic Ocean will be ice free during the summer months. This occurrence would in itself have little or no effect on global sea levels, since the melting of ice floating in water does not affect the water level. However, serious consequences to sea levels would eventually result, because __________.
22. Which of the following most logically completes the passage?
(A) large masses of floating sea ice would continue to form in the wintertime
(B) significant changes in Arctic sea temperatures would be accompanied by changes in sea temperatures in more temperate parts of the world
(D) an ice-free Arctic Ocean would support a very different ecosystem than it does presently
(C) such a warm Arctic Ocean would trigger the melting of massive landbased glaciers in the Arctic
(E) in the spring, melting sea ice would cause more icebergs to be created and to drift south into shipping routes
原文：因为海里的冰融化不会影响海平面-> 所以极地海洋冰川消融并不会影响海平面变化
问：如何削弱这一论证
显然，要找的选项应该让我感觉海平面变化会受到Arctic Ocean冰面消融的影响。
正确答案：C，陆地冰川融化，导致海洋里水多了，那么显然就会影响海平面。而其它选项均未提及对海平面变化的影响。
The pepper Capsicum chinense grows as a native wild plant only in South America. Birds swallow the pepper’s fruit whole, thereby providing the plant with its means of distributing seeds. Domesticated varieties of C.chinense grow in the Caribbean islands as well as in South America. Although it is unknown just when C.chinense was introduced into the islands, the introduction of the species was probably the result of human activity, because _____.
Which of the following most logically completes the argument?
A. the fruits of the domesticated varieties are too large for birds to swallow
B. C.chinense grows in the Caribbean islands under climatic conditions very similar to those
under which the wild variety grows
C. the peppers are an important part of the Caribbean islands’ characteristic cooking
D. most of the plant species in the Caribbean islands originated is South America
E. many of the species of birds that are found in the Caribbean islands spend only the winter
原文：Carribean也发现了C辣椒 -> 肯定是人给带过来的
问：如何加强
解释型论证，要么直接加强是人带过来的，要么排除别的解释（即不可能是别的因素导致C辣椒过来的）
答案：A，排除了鸟媒可能性，加强了论证。其他均为无关选项。
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