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。

王文静老师，我这道题目选了E，因为读起来感觉：a third of them作为elephants的修饰语，有一个with比较顺口也比较符合一般修饰语的语法，能麻烦您解释一下吗

问王文静老师，结合未画线部分C答案相当于用and并列了两个That从句修饰robe，且句子结构，动词时态也没有什么错误，代词they也有明确的指代，请问老师是哪里有问题？

老师请问一下，A答案为什么错？estimated 用来修饰fragments，A和D的区别就是介词 at 和 to 的区别 固定搭配？查了例句 estimate at 是正确的使用 被估计在 。。几百万年以前这个语意放在此句里 我感觉是合理的。

请问一下老师，关于这道题，我是根据 either ..or..绝对的平行做对的，但是在and并列的两个谓语 date 和 were fashioned的这个部分有点困惑。为什么不是date and are fashioned 或者说 dated and were fashioned。我认为这里是在讲述一个客观事实：这个神像可以追朔到什么时期和由什么制成，应该是用一般现在时。were fashioed 是过去式的被动语态对吧？date and were fashioned感觉也不复合并列的要求。

问MAY老师，两个“项目”的会用TT图解决，请问MAY老师像这种三个“项目”的题应该怎么解决？

问MAY老师 我用TT图解决不了这个问题，麻烦老师帮我看一下是哪里出了问题。

May老师，这是博智模考题里面的一道数学题，不理解呢

May老师你好，这道题的第三小题我的解题思路是插空法，但是做出来答案不对，请老师找找我的问题。因为题目说两端不能有女生，那我就让3个女生插在男生当中，5个男生6个空位，但要去掉一头一尾两个空位，就是C4选3*A33*A55（剩下5个男生随便排），请问老师我的思路上哪里错了？

麻烦老师帮我看看我哪里做错了

阴影区的这句话，中间的那个gives，是跟着前面哪个词的? 是哪个词发出的gives动作? 谢谢