According to a theory advanced by researcher Paul Martin，the wave of species extinctions that occurred in North America about 11,000 years ago，at the end of the Pleistocene era，can be directly attributed to the arrival of humans，i.e.，the Paleoindians， who were ancestors of modern Native Americans. However，anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them.Nor were extinctions confined to large animals： small animals，plants，and insects disappeared，presumably not all through human consumption. Krech also contradicts Martin's exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene. Still，Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians，arguing that humans have produced local extinctions elsewhere.But，according to historian Richard White，even the attribution of secondary responsibility may not be supported by the evidence. White observes that Martin's thesis depends on coinciding dates for the arrival of humans and the decline of large animal species，and Krech，though aware that the dates are controversial，does not challenge them；yet recent archaeological discoveries are providing evidence that the date of human arrival was much earlier than 11,000 years ago. 　3. In the last sentence of the passage， the author refers to “recent archaeological discoveries” (lines 27-30) most probably in order to 　　(A) Refute White's suggestion that neither Martin nor Krech adequately account for Paleoindians' contributions to the Pleistocene extinctions 　　(B) Cast doubt on the possibility that a more definitive theory regarding the causes of the Pleistocene extinctions may be forthcoming 　　(C) Suggest that Martin's， Krech's， and White's theories regarding the Pleistocene extinctions are all open to question 　　(D) Call attention to the most controversial aspect of all the current theories regarding the Pleistocene extinctions 　　(E) Provide support for White's questioning of both Martin's and Krech's positions regarding the role of Paleoindians in the Pleistocene extinctions 老师，我在做这道题的时候，首先定位到最后一句觉得没说什么重点，就有个yet转折，可能这是用来驳斥前面的某些观点的。所以看选项找有没有驳斥的意思的， 发现5个选项全都在驳斥。。。心里慌了往前找。再回去找的时候时间已到。我就随便选了个B（时间一到各种混乱），因为在做这篇文章之前，我大体看了下原文，记住了原文讲的是P反驳M，W反驳P。后来答案我也看明白了，我认为我做这道题的思路出现了偏差，我想问一下应该怎么修正。

这道题感觉像是要找规律，但还是没有思路，想请教一下老师，谢谢

麻烦唐瑭老师解答一下～这道题在做的时候我其实问题有点没读懂，就读了最后一句，然后提取出来的关键点是在讲tax一直在征收but汽油的税收没有增加，只有CE选项提到的汽油，但是C在讲汽油进口是新东西，所以我选了E。想麻烦老师解释一下正确选项C，再告知一下这道题应该看哪句话。谢谢～

这道题答案选E但我选了D，难道这里的land不是动词然后intact不应该用副词吗？求解答谢谢！

麻烦唐瑭老师解答一下～这道题我做对了，但是没太懂，我定位了最后一句，感觉在讲maize和monarch butterfly之间的关系。没太读懂各选项，但只有C提到了这两个东西，所以选了C。麻烦老师讲解一下～

请王文静老师回答一下这个问题，谢谢！具体疑惑附在图二了

麻烦唐瑭老师解答一下～这道题看了题目后我没有回看题干，想问一下题目是不是在说利润增涨和涨价没有关系？我选了D，正确答案C，麻烦老师讲一下CD，谢谢～

这道题选E，我错选了D，请唐瑭老师讲解一下这种类型的题该怎么写？必须看完全文吗？怎么对比选项？希望老师把方法讲得详细一点，谢谢！

请王文静老师解答一下，谢谢1.不太会判断ACD（C是因为the magazines’…consumption to convince…money无法作主语？D是因为with不好所以排除？2. 感觉后半段“出版者说服R地中产去花钱是内政主要部分”和破折号之前部分的句意并列不了

老师我想问一下这道题，从6b=ab不是可以推出a=6吗，有点懵，求解答谢谢老师！

这道题答案选A，请问老师怎么用A推出来呀？我自己总感觉虽然能确定四个数的大小，但是比值大小不太确定