A they think is ...中的they应该是人，句子里头没有”人“的名词。
C 比两个动作，than后面不需要that来指代fat。
D 比两样东西，than后面要有that来指代fat。
E 比两样东西，than that 应该用in livestock，不是of。另外后面their和they指代的是不同的对象。
【转自CD-h大神】
D、
重点不是说从logging site运到factory，而是落在后半句，也就是说运输成本的问题。
因为题干说到wood chips occupy less than half the volume of the branches from which they are made，
也就是说branch加工成chip是要耗损的，耗损的量大概是一半多。
which means排除CD，因为which在GMAT里边只能指代名词，不能指代”一件事“。
E里边living in a society that is highly cooperative, organized是状语，修饰的是前面的句子，cooperative和organized之间用的逗号；Yellow jackets number among ...social wasps和后面的and it consists of almost all ...并列，那么it就是指代的yellow jackets，应该用复数代词。
A里边where they consist ...的they应该指代的是单数的society，错误。
B consisting almost ...是做的society的定语，正确。
比较的题型：1）比两样东西（名词），2）比两个动作（动词）。
这里比较的是两个动作，所以，有一个省略用法 [sub+verb]+modifier，只保留modifier，选C。
如果是比较两个东西, 比如circulation in.... is lower than that in ....，就应该是D。
（newspaper）{had} 《lower circulation》 in the six months than（newspaper）{ had} in a similar period
改写为两个东西比较：the circulation of newspaper in the six months is lower than that in a similar period
如果有两个with，后面的strained to the breaking point就只能修饰第二个with后面的那个名词，语义上就不对了。 比如A，意思就是”因为客户的耐心和马上就要爆了的网络“，”顾客的耐心“到底怎么样就没说。由此可以排除AD。
B：a series of new initiatives that try to relieve...不对，try的主语是initiatives，不是company。
E： try relieving在这里不对，要用try to do
This uses a quite idiosyncratic idiom, involving the verb "to usher." The literal use of this word is the action of the person called an "usher," the person in a theater or at a classical concern who escorts patrons to their seats. Metaphorically, it is used about anything that brings something into existence. The basic idiom is:
I usher X in.
If I want to specify the region in which this X is introduced, I would say:
I usher X into A.
The "in . . . into" is redundant and wrong: choice (A) & (B) have this, and the "in . . . to" in (C) is far from ideal. Choices (D) & (E) get the idiom completely correct.
This is not a strict rule, but "continue" +[infinitive] sounds formal and sophisticated, whereas "continue" +[gerund] sounds casual and colloquial.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Choice (E) is the tricky one. A comma-which modifier refers to a noun and that noun has to be close enough to the modifier that the relationship is clear. In this case, a broad area (of high pressure) is that noun, and it is in fact only one word away from the modifier—but, unusually, a verb (builds) comes in between. A lot of people will cross this answer off because, typically, a verb does not intervene between a noun and a noun modifier.
This particular clause (while a broad area of high pressure builds) is itself a modifier of the main sentence that appears before it. In this case, the author must choose between these two constructions:
… while a broad area of high pressure builds, which will bring fair and dry weather for several days.
… while a broad area of high pressure, which will bring fair and dry weather for several days, builds.
Given the length of the noun modifier—and the shortness of the verb—an author might choose to place that verb first. Think of this as an extension of the convention that a noun followed by two noun modifiers will place the essential modifier first:
The box of nails, which is sitting on the table, …
It’s still clear that the second modifier refers to box, as in choice (E) it’s clear that the which modifier refers to the broad area of high pressure.
【转自RON】关于D
It's nonsense, because "$xxxx in yyyyy" would mean that yyyy is something that can actually be measured in dollars.
E.g.,
By driving a hybrid car, I will save thousands of dollars in fuel costs.
Your business can save over $10,000 per month in shipping costs by using XYZ Courier Service.
扫描二维码，直接登录
果因
∵Antarctic阳光直射、海水富含营养 ∴海冰表面生长藻
但雪堆积适中的地方藻长得比雪少的地方好，虽然雪会让阳光散掉
解释，寻找原因
A、因为雪的重量把冰面往下压，所以更多的水花飞溅起来洒在海冰表面（有营养）；提出他因，使矛盾化解
B、Antarctic的海水比其他地区富含营养；无关比较
C、气温降低，下雪、积雪可能性下降；无关
D、藻类赖以生长的营养在Antarctic很多；无关
E、冰层比同样厚度的雪层更会把光弄散；无关比较