陆旭老师，我有一些做过的assumption题目取非的句子搞不清，你能帮忙看下吗(不说这道题目的解题思路，单纯就是取非问题，特别是双重否定或者从句里面有否定词） 1.No part of a person’s brain that is damaged by a stroke ever recovers.---> some part of a person's brain that is damaged by a stroke ever recovers. 2.Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.这个句子我不太会取非，正过来说这个句子就是Impairment of linguistic capabilities occurs in people who have suffered any damage to any language center of the brain.那么我取非是Impairment of linguistic capabilities occurs in people who have not suffered any damage to any language center of the brain. 3.If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them. 取非If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages nothing of them. 4.这题出现两个not The collection fee will not significantly affect the purchasing power of most residents, even if their households do not reduce the amount of trash they put out. 我取非直接去前面的not: The collection fee will significantly affect the purchasing power of most residents, even if their households do not reduce the amount of trash they put out. 5.这个也差不多 Not all steel producers were unaffected by country A’s newly imposed tariffs. 我取非All steel producers were unaffected bycountry A’s newly imposed tariffs. 6.There are no plants native to western Africa that, if domesticated, could serve as staple food crops. 这个if domesticated是不是可以不管，直接改成There are some plants native to western Africa that, if domesticated, could serve as staple food crops.

因为X和Y都是正整数，则只会发生两种情况，（X，Y）——（5，2）和（8，1）所以条件一说了X<8 则只会出现（5，2）的唯一情况，成立！条件二说Y>1 则也只能确定（5，2）的唯一情况，也成立呀！我选的D，就是一直找不出我的思维漏洞在哪，求解！

老师，听了OG精讲课程，老师是按照每个truck里面装三个shipments来解答的，但在这道题中并没有说到每个truck里装三个shipment，所以我觉得两个条件分别都不能，但合起来可以解答题目问题。请问我的思路有什么问题吗？

这题考点是so as to吗，为何这题E选项不能理解为to convert和for establishing平行呢

请问培月老师，看到选项我直接把DE排除了，因为airline被期望增加。。。这个语义很奇怪，应该是希望航空公司主动希望通过购买飞机来增加增加呀。所以在ABC里选了一个相对好的，请问这里的语义逻辑怎么考虑啊？

老师 428题我能选出来B（根据原文has led to...)但是在当时做题时我同时在纠结E选项。因为我不确定文中是在说说服还是在说需求。麻烦请郭培月老师解答一下～

我知道A和B错了，但是有个疑惑，““逗号”+非谓语”，所以A和B这里的prevented难道不是修饰主句的主语sound吗？为什么在这里用于修饰distances了呢。是老师说错了，还是我记错了？

C和E的排除中，老师给出的排除方法是在没有硬伤的情况下，主动优于被动，所以选择C选项。但是我当时的思路是，C当中的stationary在that的从句当中，只修饰到了troughts，而E当中的stationary则同时修饰crests和 troughts，在不知道troughts 和 crests是什么意思的情况下，我认为同时修饰两个要比单独修饰troughts好。就像以前那道uncontrolled和that was controlled那道题。

CDE排除的过程中，我的思路是who怎么能够就近修饰law firms呢，所以就选择了D，我也确实看到yet了，但是我认为可以做副词可以放过。请问我的思路有什么问题吗？

请问老师，这题条件二也推不出啊！条件二还有可能a大于1，这时候就不能确定x大于0了，所以是否答案应该选E？

最后留了ADE 觉得now部分应该作为结果伴随，排除A，在DE中选，因为about离knowledge越近越好，选了E 我想问问老师，1.这种ADE最后只有结构上的不同时，是由于句意重心导致选A的吗，着重强调现在有conclusion而非过去的研究；2.DE之间的对比，E把over 20年放中间来使得about。。离knowledge近是比D更好的吗。