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。

请问为什么不是A？❓

请问此题为什么不是B而是E？

为什么不是C？

@May 老师，想请问一下GMAT考试数学部分，代数题目多吗？在整个31道题中，大概会占多少比例？考察点是有规律地按比例出现吗？有的话，几何、应用题等又分别占比多少？谢谢！

请唐塘老师解答下这道主旨题如何通过范围大小作答是?D和C比的时候比不出来. 其他几个可以说说思路吗 我对比下老师的思路和我排除的思路

金老师，有两个问题烦请帮忙解答。@金栩竹 1. 语法基础课，定语从句，例8，答案选C，主语是A pair of architects，谓语动词不是应该用单数形式嘛？ 2. 为什么说GMAT中不会出现which指代整句？

金栩竹老师，不好意思，因为我有几道题目想并在一起比较一下，所以还是通过截图来提问了hhh,第一道问过的这题，老师你说可以通过it无所指来去掉选项，但是it不是很明确地指代前面的43 percent嘛，老师你不是说代词只要看到有可以指代的就可以pass吗，还有compared with 后面是不是得紧跟要比较的对象，不能是a dacade ago，而且compared with a dacade ago是不是不能想成是省略一部分内容啊？就是类似于than以前后省略一部分，只留下状语这样。 第二题，比较对象是数字，所以不能用those指代人对嘛？ 第三题，为啥c不对啊？谢谢老师!

金栩竹老师，我想请教一下这个题目，能麻烦讲一下每个选项到底哪个和哪个在比，哪里错了嘛，我就是遇到xxx percentage of xxx，这种不知道怎么比较，到底对象是数字还是人

金栩竹老师，请问having done不能限制性修饰名词这是什么意思？E 选项不看别的错误点，只看having done 和were butchered不能平行，是因为时态不能平行:现在完成时和过去时不能平行还是因为主动与被动态不能平行呢？

请问唐塘老师这道题,由于我看的录播无法听到此作业题讲解时提问. 这道题你在讲的时候说用UG定位然后通过读文章发现并不是实验的结果然后再看上面一句. 我当时做题时直接用的是Theoretical economist的观点定位可以吗? 因为这和之前你讲的那个K`s objextion to M`theory差不多应该定位M的理论. 你要想undermine和object.那得和Theoretical economists说的内容沾边. 请问这样思考对吗?