D，attempt/try sth，试一下某物，如try this food, 尝尝这道菜；try/attempt to do sth，设法做某事，尽力做某事

surviving...

two decades of economic shifts核心词是shifts，two decades做定语修饰shifts的时长，比如：a glass of water

被动承受者没有这个能力，这个语义是不对的，是别人要来分辨他，应该是别人分辨他的能力
**研究鹿占领这个岛，而不是这个岛被鹿占领的

In choice D, "an obstacle..." is a modifier of "the concern".
As a result, choice D implies that the concern IS an obstacle.
E it没有指代对象

look at the placement of the modifiers.
"that the bank's loans with..." should immediately follow "the concern", since that is what it modifies.
similarly, "as an obstacle..." should be as close as possible to "cite", because that's what it modifies.

in the correct answer, both of these modifiers are placed immediately next to the things that they're supposed to modify; in (d), both constructions are needlessly separated.

DE if条件状语，不能作为定语修饰drug，错
B whose intended use is for adults and children。也就是drug‘s use is for adults. 这是个主系表结构。在逻辑上，我们只能说，这个药是给成年人和小孩用的，不能说“这个药的用途是对于成年人和小孩的”。
ADE mandate 是BOSSY词，不能接must

ron：the gmat will only do the second of these,so you can rest assured that the personal pronouns (who, whom, he, she, him, her) will be used only for human beings.GMAT里只会考察who指代人，不会考察动物拟人化，所以指代动物时统统用which

as many as 和up to不是考点吗……这题应该用排除法
A they和them指代不同名词
B 分号后要加完整句子
C overturning逻辑主语变成moth而不是bear
D 同样指代错误
E 觉得which有点怪，但"who" is used for humans，sometimes "who" is used for animals that are personified (such as people's pets), but the standard is "which".

rather than和instead of的区别:
语意：rather than表示it's A but not B，instead of表示用一物取代另一物
成分：rather than做连词，表示并列关系；instead of做介词时构成介宾结构，做定语修饰先行词或状语修饰谓语动词，属于修饰成分，地位更弱些。
instead of通常是介词，也可以做连词的，如：They go there on foot instead of by bus.

链接到Prep2012-SC-18，instead of后面接的是名词，也是rather than更优。

A,a vantage point combining with her talent for writing to make her the valuable one.
combining with her talent for writing 作定语修饰point，to make her valuable作定语修饰point或作状语修饰动词combine，to表目的，用在此处逻辑不对，不是为了使她成为最棒的那个，而是时间点加上写作天赋的结果是她成为了最棒的那个
B,所有when+某个动作做状语的都需要特别注意，它表示当（且仅当）发生某个动作时，主句才成立。当和她的写作天赋结合在一起时，时间点使她成为最棒的那个，当不和写作天赋结合时，时间点就不能使她成为最棒的那个，但句意没有这个意思，同时也并不是要强调只有和时间点结合时她才是最棒的这件事

我觉得这里的these指的是 Endorphins,而morphine’s 是morphine’s release 的省略

each of which饰定语，修饰planets，是根据体积和距离来影响拉力大小的星体
each 是同位语或独立主格，可以修饰整个句子：移动起源于拉力。如何起源，每个星体通过各自的体积和距离来影响拉力的大小。

剑龙，卡哇伊得死哪～

通常情况下，状语就近修饰一个动作，不管这个动作是在主句、从句还是短语里。
如：beautiful A and B，beautiful可以只修饰A也可以A/B一起修饰；beautiful A and nice B，beautiful只修饰A，因为nice把B隔开了。

D/E，Over the past few years是在修饰主句，因为as把over和从句隔开了，所以over只能修饰主句。

语意：
instead of更多表示替代，介词；rather than表示是……而不是……，连词。

I'm going to make air conditioners quieter. --> I'm going to modify existing air conditioners so that they make less noise.

I'm going to make quieter air conditioners.
I'm going to make air conditioners that are quieter.
--> I'm going to make a new model that makes less noise.

A is like the first one of these, so it doesn't make sense in context.

B C 错误的原因是因为 ,ing修饰的是主句的逻辑主语 the 32 species，而不是杀人鲸，所以B C错。 另外as big as 不能和long连用，语义重复。

(B) benefits, letting employees pick the most important of them to themselves
Pronoun confusion. We should use "them" to refer to "benefits" while using "themselves" to refer to "employees" within the same clause.

(C) benefits and letting employees pick the most important to themselves
- "the most important"... what? We need something to stand in for "most important benefits"

两个因素使可可涨价：供应减少、需求增加。
欧洲和北美的可可的处理的量增加了8%，用来说明需求增加。
B，欧洲和北美生产商扩大了产能。
CR：既可以看成是需求增加的证据，也可以看成是供给增加的证据（产能扩了，产量/供应量就上去了）。比起C纯粹证明供应不能立即增加，C的strengthen更强。