D : "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. They 指代有误 canaries' 是所有格无法被they 指代

b选项漏看了it

in that choice, the presence of both "from" and "since" constitutes redundancy.
It starts with "when" and the word when refers to a time or date (in this case, a date. That date needs to be placed right before the "when." C, D, and E do not put that date right before the "when" (that is, at the end of the answer choice).

这也能错？3/10^2=0.03

91/7=13

y-x>5可得出y>x+5，因为x是偶数，偶数+奇数为奇数，y是奇数，则y>=x+5+2
z,y都是奇数，z>=y+2，则z>=x+5+2+2

nutrients that thrushes need for migration and that insects lack---- 不是lack of insects! 不要瞎读脑补。。

第一句话： （眼睛感觉光） -> （PD分泌M）-> SW Cycle正常
第二句话： （眼睛感觉光） -> VC受伤 -> SW Cycle仍旧正常 来转折第一句话

实际两句话一起，里面暗含了一个传统的神经传导链路：
（眼睛感觉光） -> (VC处理) -> (PD分泌M) -> SW Cycle正常

最后So引导的argument是：
以上链路可以不通过(VC处理)。 那只要分析没有 (VC处理) 的且SW Cycle正常的totally blind person，是否(PD分泌M)，就可以知道是不是有另外一条链路。

看清楚最后一句，最后一句是解释游离油酸，不是说游离油酸可以决定油的质量

multiple of pt：pt的倍数

关于比较对象的问题：
i.e.,
americans in paris are happier than those in berlin.
--> there are 2 different sets of american expatriates -- one set in paris, the other in berlin. the former are happier than the latter.

americans are happier in paris than in berlin.
--> this sentence implies that the same people would be happier in paris than in berlin.

个人感觉老师的解释还是有问题，我自己的理解：
C/D, 排除excepting for... 并不是因为except后面不能+for，而是因为后面domains，”在某个领域“的惯用用法是in the domain

Ron: https://www.manhattanprep.com/gmat/forums/the-anasazi-settlements-at-chaco-canyon-were-built-t2236.html
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

嵌入式分句：In his breast-pocket he had a patch of scarlet, which i suppose was the paper cap serving as a handkerchief.

嵌入式关系分句：In his breast-pocket he had a patch of scarlet, which i suppose was the paper cap serving as a handkerchief.

unlike 对比两个名词， whereas连词对比句子

smallpox vaccine 天花疫苗
GSK‘s vaccine 葛兰素史克（制造的/拥有的）疫苗
大概应该是这个意思

要明确Mary的贡献和X、Y的关系， 可以通过--Mary contributed to archaeology with/by X, and Y 在这里核心词为V contribute ， with/by 后面所跟的X and Y 修饰核心词V contribute ; 或者通过May's contributions include X and Y 这里核心词变成了contributions 也是可以的。整个时间都应该是以contribute/contributions 作为核心的逻辑意义， 而不是Mary本身的一个属性。

in addition to的意思是：除…之外…。其连接的两个名词不一定要具有可比的关系

1.when X, Y…. 注意:只有当A发生时，B才发生。A不发生时，B也不发生。
本题的当她起草某份宣言时，她在宣言里纳入了一个关于女性的呼吁，纳入呼吁发生的时间确实只限制在起草宣言时，when的用法ok
2.if you write "when X, Y"... Y has to be IN THE SAME TIMEFRAME as X.
the "had ___ed" tense implies a DIFFERENT (earlier) timeframe, so, it's nonsense in that context.

B：a draft was adopted❌，that也没有就近修饰，不太好