我不是NN，所以逻辑考感觉完全不行，所以得好好分析，可是我分析不是很到位，请教大家。
现在，我在weaken题型里面分不清楚条件削弱的题目，不知道该怎么分析，能不能教教我呢？
还有lawyer有讲
条件型结论：结论带条件（即为充分必要）。WEAKEN的方法显示充分条件成立，必要条件可以不成立。或举反例，或提供有关信息。能不能说说3种weaken方法？或者有没有例子？
lawyer还提到，原文前提和结论关系不密切：正确选项直接WEAKEN结论,有例子么？我好像做的题目太少，还没做到
lawyer还提到，原文前提和结论关系不密切：正确选项直接WEAKEN结论,有例子么？我好像做的题目太少，还没做到
下面就是我不知道该怎么分析的几道题目
45．Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied. Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern, non-forager societies.
Which of the following, if true, would most weaken the criticism made above of the anthropologists’ strategy?
(A) All forager societies throughout history have had a number of important features in common that are absent from other types of societies.
(B) Most ancient forager societies either dissolved or made a transition to another way of life.
(C) All anthropologists study one kind or another of modern-day society.
(D) Many anthropologists who study modern-day forager societies do not draw inferences about ancient societies on the basis of their studies.
(E) Even those modern-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies.
这题完全不知道怎么分析，除了读懂题目，自己理解意思。 请大家帮忙
这题完全不知道怎么分析，除了读懂题目，自己理解意思。 请大家帮忙
36．Offshore oil-drilling operations entail an unavoidable risk of an oil spill, but importing oil on tankers presently entails an even greater such risk per barrel of oil. Therefore, if we are to reduce the risk of an oil spill without curtailing our use of oil, we must invest more in offshore operations and import less oil on tankers.
(A) Tankers can easily be redesigned so that their use entails less risk of an oil spill.
(B) Oil spills caused by tankers have generally been more serious than those caused by offshore operations. 加强
(C) The impact of offshore operations on the environment can be controlled by careful management. 加强
(D) Offshore operations usually damage the ocean floor, but tankers rarely cause such damage. 无关
(E) Importing oil on tankers is currently less expensive than drilling for it offshore. 无关
这样分析对么？if后面是充分条件，选A的话是使充分条件成立，必要条件不成立？
30．Robot satellites relay important communications and identify weather patterns. Because the satellites can be repaired only in orbit, astronauts are needed to repair them. Without repairs, the satellites would eventually malfunction. Therefore, space flights carrying astronauts must continue.
Which of the following, if true, would most seriously weaken the argument above?
(A) Satellites falling from orbit because of malfunctions burn up in the atmosphere.
(B) Although satellites are indispensable in the identification of weather patterns, weather forecasters also
make some use of computer projections to identify weather patterns.
(C) The government, responding to public pressure, has decided to cut the budget for space flights and put
more money into social welfare programs.
(D) Repair of satellites requires heavy equipment, which adds to the amount of fuel needed to lift a spaceship
carrying astronauts into orbit.
(E) Technical obsolescence of robot satellites makes repairing them more costly and less practical than
sending new, improved satellites into orbit. （给出另外一个解决方法）
这边不能归为给出他因阿~因为它直接否决了前提，该怎么分析的呢？
非常感谢大家了。
我不知道这样的复习方法对不对，还向大家请教了
不知道为什么有些字体改了3号，但是还是那么小。
自己顶下，希望大家帮帮我~
建议LZ下次顺便给出答案。
45我选了A。我的思路是：
原文说研究现代F是为了了解古代F，但是这样是不对的，因为F很多种多样，所以很多研究者觉得相似的F其实都来自现代的非F社会。
要削弱。
我选A是想说，贯穿整个历史，无论如何变迁，F现代与F古代都有其相似之处，而这些相似之处是非F没有的。这就推翻原文说这个研究有缺陷了，因为研究者可以凭借判断是否有上述相似性来考证是否属于F社会。
仅一家之言，万望不吝赐教。
至于lawyer的心得，我建议LZ先做一段时间题再回头看，会有些感同身受的感觉，现在看我想还理解不到那个意思吧
后面两题我看了一下，没有用过LZ这样的方法所以没有什么想法
我想楼主做题的时候还是多着眼于题目内容，不要光想着他因啊条件啊什么的
否则会象SC那样陷入误区，一上来就狂找语法错，结果自我都迷失了
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