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。

麻烦金帮我解答一下这一题，我的思路是看主语“T的风格和选择”，先不看破折号里面的修饰内容，然后根据主谓一致排除了ACD ，然后看BE，然后就没什么思路，这题是考时态，还是比较？就是关于这个AS AS 我知道的点是它一半用于同级比较，然后根据as 后面的代词去接着判断？

三个因子怎么得出X=a²，请在详细推理一下，不是很懂

老师，这道题根据您的答案，定义应该是1000＝2的9次方乘以X。 但是这样的话这个X就不能是整数了，不符合上面92题的定义呀。 所以没想明白，觉得应该还是1000＝2*2*2*5*5*5。选E

从条件1看，p也可以等于32呀！ 32是2的5次方，所以的质数可以写成1和2，同时为了满足＞1的条件。只是只能是2，所以不能准确推理呀 只有当两个条件合起来，p是33或35时才能满足。因此应该选C不是A

请数学老师说下思路

张老师你好，这道题目我不太懂C为什么错。因为这道题目我的方法是直接定位到黄色highlight部分，然后看这句话的前后句子，因为前面一句话看着好像比较无关，我就重点看了后面一句话，说了这些guilds的women是有legal和economic的privileges ，所以我一看C就对了。然后正确答案是A，不太懂怎么才能选对，也不理解c为什么是错的，虽然A看了这句话也对，但是考试的时候做这种题目我为了节约时间通常都是只看highlight附近的句子的，求指教！然后这类型的题目大概难度系数是多少？谢谢

老师，请问这倒是题目的考点是什么！C选项中哪里错了？我理解的是with it的it指带不清楚，求老师指教！谢谢！

which of the following about the insects from which animals acquire carotenoids？老师您好怎么判断这句话是倒装呢？我理解的意思就是昆虫从动物获取carotenoids

麻烦金老师帮我解决下这一道题，此句的核心语意是A这个人开始翻译 I 这个作品，后面一个同位语从句进一步解释这个工作花了多少年和S对它的评价。根绝a work that and that 这个平行结构先排出了 A E ,然后C 答案的 had taken 和 began 时间点上是冲突的，先开始了，才有完成的事，所以had taken 过去完成时在这里用法不正确。对比B D ，文学批评家S 宣称最好的译品；文学批评家S宣称它做为最好的译品。。我觉得后者更好，尽管有一瞬间也纠结了IT的指代问题，麻烦老师帮我辨析一下，正确答案B“S宣称最好的作品in。。”感觉话没说完整。

请问老师，这里的reduced by 150,是减到150，还是剪了150