The number of which cannot logically refer to the noncount noun population or to the singular wolf, which is used adjectivally here to modify population.
"However" is intended to serve as a conjunctive adverb between the two independent clauses.
A semicolon after area and a comma after however would make the intended function of however clear.
还有比较关键的一点从GMATCLUB上得到了解答：We can say either the size of the wolf population or the number of wolves.
In Choice D, which CANNOT refer to the wolf population because then Choice D will have the phrase the number of the wolf population.
This expression is incorrect the population cannot have any number. Choice A has the same error.

划线部分与非划线部分的连接处，选项之间的差异，非划线部分是一个名词，movement
A：similarity 不能 explained as movement 去掉
B：Thule artifact在从句结构中，语义不对，去掉
C：that一件事不能被explained as movement，去掉
E：解释不能是一个movement，去掉

Take away：as much as 修饰不可数名词，as many as修饰可数名词。
Split#1：hours是可数名词，去掉选项A、C、D
Split#2：more...than...固定搭配，去掉选项B

五个选项中有四个是semicolon结尾的。
Split#1: 第一个or前后平行，去掉选项A、B、C
Split#2: 剩下两个选项对比，发现应该三者并列符合语义，去掉选项E

A. The opening phrase correctly modifies the subject, the
army of terra-cotta warriors;
they must clarify two things about the army of terra-cotta warriors: how old it is and how long it took to complete.

Take away：“It”和“this”只能指代前面出现过的" age of eighteen"而且是在this nation里面的。不像those和that可以copy。只有选项E符合。

Split#1：比较的应该是动作，去掉选项C。选项D中of后面应该是doing形式，去掉选项D。选项E中in place of意思为“代替...”，语义不对，去掉。
Split#2：than 前后应该都是动词，去掉选项B

volunteers' vs.volunteer 所有格作形容词 不能指代名词

根据句意uncover new areas是b伴随ice cap融化发生的。只有选项A符合，melt处在一级，uncover处在次一级。

letting vs. and let , and平行, those most important vs. the most important, them vs. themselves

Split#1:not only...but also...固定搭配，去掉选项B、C
Split#2:从右往左确定比较对象，but also 后面跟的是"exploration of sth"的结构。去掉选项A、D

I think the correct answer for 10 is A

C选项中 business and financial records in the nineteenth century中应该用of吧，表示19世纪的记录，而不是“在19世纪时的记录”

仅仅次于大豆，次于的仅仅是大豆，中文和英文的博弈

1) 区分conclusions和facts，conclusion是claims，而facts不能是claim。
2) 小心作者的态度 Some commentators have argued, [correctly], that since there is presently no objective test for whiplash, spurious reports of whiplash injuries cannot be readily identified. #这里的correct说明没有in the argument，即选项E不对。
3) 看清选项，A中的that conclusion指的的是the conclusion that the argument criticizes.

D 里面的 “成本差距大，所以Name Brand在价格上不能有效缩小和Store Brand的差距” 是我们自己脑补的，而非题目中的信息。

原文：Hachnut wants its managers to have international experience#说明目标是int'l exp，目标达到了#
C)The first introduces a practice that the argument seeks to evaluate; the second provides grounds for holding that the practice cannot achieve its objective.#能达到目标

D)The first introduces a policy that the argument seeks to evaluate; the second provides grounds for holding that the policy is not needed.#not needed 因为有alternatives
#纠结时搞清楚选项的差异#

整个句子的意思：查克峡谷的Anasazi居住地建造的规模宏大，有超过75个复杂的工程结构，每个工程结构都有超过600个房间，所有的工程结构之间由复杂的区域路径连接起来。
with表伴随用来进一步解释和补充spectacular scale（怎样的规模宏大？内部包含超过75个工程结构）。
connected with each other是作为modifier修饰structures的，所以不能加were。正确B
【补充】analogy:
the USA comprises 50 states, each of which is united by a federal government --> wrong (the implication is that each state has its own federal government)
the USA comprises 50 states, all of which are united by a federal government --> correct
the USA comprises 50 states, (all) united by a federal government --> correct, whether you have 'all' or not

【转载】文中说的是：测谎仪有的时候是没有结果的（即不显示被测试者是truthful还是untruthful），但是，（sometimes）有时候employer会拒绝这些测试结果为inconclusive的求职者。
错选A，A太绝对了，题目中用得修饰词是sometimes而不是most！！
解释C选项：这个inconclusive的测试结果对于被测试者是不公平的。
（对啊！就是不公平的！很有可能人家实际是truthful的，但是却被employer拒绝了!!）

【A are exhibiting B 比较的其实是B，而不是A，这个点一定要弄清楚，在这样一个句式里面，作者其实是在比较B】，所以选项B，rates of entrepreneurship不能同other immigrant group相比，选项D the rates of entrepreneurship不能同other immigrant group相比。(C) 正确, 用those代替前面出现过的rates,比较双方对应