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。

麻烦金老师回答，这题because 后面说明原因，原因还比较长，一句完整的话比较好，所以我首先考虑 A C D 然后在对比差异点上 关于到底是 especially 还是 specially ，还有削弱能力这个表达上实在选不出ACD 哪个更好 不是特别清晰

麻烦金老师回答，这题我读到的大概语意是M这类人居住在什么地方，后面的划线部分应该是紧接着修饰的，然后就没有下手点了，想听听老师的思路。

麻烦金老师帮我辨析一下BC 我能大概GET这题是在考比较考点，就是少数名族毕业生比其它类型的毕业生的四倍，我比较迷惑的点是C答案里面的这个as as ，这个不是同级比较么？顺着读，少数名族毕业生接近四倍和其它毕业生一样，感觉不通顺，相反我觉得B答案少数名族毕业生比其它类型的多四倍，读起来顺一点。我对比较级的这几个词理解的不是很透彻，麻烦老师帮忙辨析一下。

数学老师您好，这道是前两天更新的jj题目，因为我没有学过国内的高中数学，所以我不太能够理解答案里面所说的：K>0,可以判断出抛物线的极植点在x的上方？我想如果a（x-b)^2+k一直小于0，那这个抛物线就不会和x轴有交点

老师 我在想这道题是不是可以选A，我想的根据条件一，先假设中间大小的角和x相等，所以得出：3x+10+x+x=180，可以算出x和中间大小的角相等的情况下等于34，然而34应该是x最大的可能性，所以x一定小于34，锁体条件一单独成立。老师我不知道我的解题思路对不对，求指教

May老师，这道鸡精题目我算出来是A，确定答案对吗？

这题完全不懂 麻烦数学老师解答一下 谢谢

请数学老师讲解 一下图片题 另外我之前问的一道题 您没有解答清楚b选项 A certain list consists of 3 different numbers. Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers? (1)The range of the 3 numbers is equal to twice the difference between the greatest number and the median. (2)The sum of the 3 numbers is equal to 3 times one of the numbers.

麻烦金老师帮我解答一下这道语法题，首先我特别迷惑的点是关于这个which的指代，麻烦老师帮我辨析一下，之前老师说which不能指代整句话，要在前句有与之对应的名词，如果出现多个名词which的出现就会犯指代不清楚的错误，就是说前句只有一个名词不管是单复数都可以用which准确指代上是这个意思吗？刚开始做这题的时候一眼扫过去有results 和 company’s cost-cutting measures， profits 三个复数名词就排除掉了了ABC，因为我觉得which 在这里会犯指代不明的错误。事后看了正确答案，是因为of the company’s cost-cutting measures 只是results 的修饰语 ？那也还有profits 呢，从语意出发我觉得没毛病，但是这个which在这里有点指代不明。相反我觉得我错选的D答案前句的语意是“公司削减成本措施的结果在其利润中很明显”with。。（伴随）这这样一个结果，语意很通顺，也没有什么歧义，麻烦老师帮我辨析一下这几个点

麻烦金老师帮我解答一下这道语法题，老师我看到assumed 这个词就觉得后面应该接一个虚拟语气，我这样判断会不会太武断？我直接就排除掉ACD了 。还有就是纠结了一下这个代词的问题，这个IT指代到stategic ？, Morocco？关于这个their 犹豫了一下这个顺着读是摩洛哥对法国人感兴趣，但是看这个代词their 和 they 应该是法国人对摩洛哥感兴趣