The long dash is used to indicate an example or an aside. Eliminate C,D and E.
Then, between A and B, only A follows parallelism. "Archaeologists have excavated a hull that is X and that represents Y." Only A does that correctly.

appoint sb. sth.
shattered//had done(NOT‘had been')
根据逻辑主语先排除BC，A中had been和shattered不平行，排除A
E中 WRONG---- sb. be appointed to be/as sth; WRONG-----either in the case of sb. or of sb's

"Being" can be used correctly, but it almost never is on the GMAT.
'MIGHT BE"和“Possibly”可互换
平行结构 ：hints of【 oil supply disruptions…or any unexpected growth】

D：The phrasing "save $ in X" is not ideal...
E：reads "companies could save $58B by preventing X...and gain $200B through Y" where the correct idiom "save $ by doing X" (i.e. to specify how money is saved) is used. Also, X and Y are parallel nouns (illness and performance) correctly completing the idioms "by preventing X (one thing) ...and through Y (some other thing)" "preventing" is a noun form ("gerund"), as can be seen from the fact that it's the object of a preposition (by). in fact, -ING forms by themselves are never verbs
反思：1.动词ing形式本身不做动词！！
2.main clause 的两个主要动作：…save…and…gain…… ，进一步…save$ by X (preventing illness)…and…gain $ through Y(improved performance).

这题是什么鬼……前后根本没啥联系，看得我一头雾水= =

题目没有说一定是最大数要大于，为什么选择C呢，因为存在小于的情况啊

4n能被3整除，说明n是个能被3整除的质数。能被3整除的质数只能是3，3再往上翻倍就不是质数了

整个第二段在解释为什么早期女权主义者归为保皇派
G的解释是：君主制的以君主为中心，转变到女人以自己为中心，所以女权主义者归为保皇派
C选项，C的作品是很独立，并且别的早期女权主义者也没看过
说明，女权主义者归为保皇派，是因为其他原因，不是G的原因，所以削弱

first of all, you can use the correct idiom 'more likely to be found ... than ...' to eliminate choices c, d, e right away. you can't write 'more likely ... as opposed to ...' or 'more likely ... instead of ...'; both of those are unidiomatic, and therefore incorrect, 100% of the time.

look no further than the 'which' in choice a, which is followed by the verb 'exposes'. that verb is singular, indicating that 'which' must refer to something singular - and there are no singular nouns in that part of the sentence at all.

一般来说，两个as后的内容平行，所以是drivers will be as likely to exceed the proposed speed limit as likely to exceed the current one，但这里完整是drivers will be as likely to exceed the proposed speed limit as they are (likely to exceed the current one)，第一个as前面的driver will be 纳入了其中，第二个as后的are与前面的be as likely to exceed的will be对应。

选项中无论是this age还是it都是就近指代the age of eighteen，文中要表达的是法定年龄，所以不能用 it, this指代，要重新表述the relevant age或者 the xxx age。
延伸：要注意一些年代、年度的考题。

正确表达Explanation for sth is (that)+完整的句子，如D选项后加there was的完整句子。
A选项简化为：Similarity can be explained as movement，即sth1 can be explained as sth2. sth1和sth2应该是同一事物，而题目中的sth1是similarity 与movement本身无对应关系。

able，unable不能与抽象的事物搭配，一般都是跟有生命的搭配。比如sb is able/unable to do something.

namely是adv.，后面不能跟连接句子；the fact of X doing Y用法错误。

错选C，这选项与正确答案E的区别在于一个强调说它们观点的不同在于认为发展中国家需要维持的外汇负债水平；而文中表达的是“国际货币基金组织支持——NIC path as the way for heavily indebted developing countries....”

从原句语义可以判断正确的平行结构是：”high wheels“ and" a floor"，在D和E之间犹豫了一下，没有关注到两句的差别：curved的时态和代词they 、it的指代是否清晰~

圆周：2*4*π=8π
已知：弧线RTU长度为4/3π
4/3π ÷8π=1/6
1/6*360°=60°
因此圆心，R点，U点组成等边三角形，线段RU=r=4

B和D因为as后面不能加介词排除，e后面的those没必要，不能是bone是those of遗骸

这题我可以排除CDE，关键卡在了AB，明明知道rise higer是累赘，但是觉得A的they指代不清，所以选了B。其实they在文中既可以指代prices，也可以指代refiners，按逻辑来讲是可以理解成prices的，没有硬伤。我局限在它只能就近指代refiners了，所以觉得应该用did而不是were。正确选项是认可了they指代prices

"examples of neurogenesis include" - so the examples should lead off with whatever the actual thing is that indicated neurogenesis. The mice aren't the example - the example is the brain growth. That eliminates B and C. A also breaks parallelism.

And the other thing wrong with A, B, C and D is "when placed in a stimulating environment" - it sounds like they are referring only to the time that the mice are in the stimulating environment - but the brain growth is permanent. It doesn't shrink back down once the mice are no longer in the stimulating environment. Ditto for the increase in neurons in the canaries.

CHOICE E：“the brain growth in mice" ---"an increase in neurons in canaries" 平行，，找核心词 “growth” --- "increase"