twice more than 比...多两倍（三倍）
twice as much as 是...的两倍

If I use "with" to introduce a noun modifier I do not use a comma before it so that it is "touching" the noun it modifies; if I use "with" as an adverbial modifier I do use a comma before it.

in the construction "x of y, which", the referent could be either "x" or "y" depending on the surrounding context.

there's also a grammatical issue, too -- like/unlike must be followed by a noun or pronoun. a prepositional phrase is not a noun or pronoun.

老师，关于That能不能修饰人，我看ron在曼哈顿论坛回答过别人
RonPurewal
Re: Can "that" modify persons/people?
Tue Mar 10, 2015 2:48 am

in formal writing this is absolutely wrong; that function is served by "who(m)".

... and as long as we're on the topic, "which" can't stand for people either.

in informal usage you'll see these quite a bit, but informal writing isn't (and can't be) tested on this exam.

B选项their range extending from Alaska to Tierra del Fuego, from sea-level rain forests to the edges of Andean snowfields and ice fields at altitudes of 15,000 feet，不理解from sea-level前面为什么没有and呢？后一个from还是修饰extending吗？

C和D的语义上查了那么多，这题好难啊。。

B与原文中的方案无关。与什么可行性，有效性都无关。可行性是指这个方案能不能实施，如果说免费发放会让公司破产，那也ok。有效性是这个方案有没有用，如果说免费发放了还是不能提升广告收入，那么ok。B只是说“NN发行量下降的一个原因是报纸质量没有竞争对手好”，？？与方案无关的

The annual interest rate earned 不是 The annual interest

Ron给的例子感觉也可以解释，信被写的时间和数量超过没有关系。

my brother, who ate bagel bites for breakfast every single day of his high school career, graduated in 1994. --> correct; his eating bagel bites had no impact on his graduation date.
my brother ate bagel bites for breakfast every single day of his high school career, graduating in 1994. --> incorrect; these are two unrelated observations, but this construction erroneously implies some sort of relationship.

there's one simple way to eliminate (c), and that's to notice that "prefer ... compared to" is redundant.
you should just say "prefer ... to", as the word "prefer" already encodes the idea of making a comparison.

way to eliminate (b) is to realize that its construction - the placement of the commas and the word "that" - isn't right.
because of the placement of the commas and "that", this choice mistakenly puts "executives are convinced" in parallel with "1/3 of customers prefer...". that makes no sense.

'with' in choice b is also bad: it seems to imply that immigrants arrived with the law in their hands.
choice c implies that the immigrants themselves are 'a law passed in 19xx'

RON：Ironically, that's a strength on a test like the GMAT. Try to emulate it: If something seems complicated, step back and see whether you can make it simple.
Their goal is to create an exam that requires sharp thinking, but not specialized thinking.

没看懂grounding原来是停飞的意思

About 5 million acres是一个介词短语，怎么做主语啊？

可以理解为因果推理，反驳结论

不仅而且 怎么是not just 和 but also ？

https://www.manhattanprep.com/gmat/forums/as-the-honeybee-s-stinger-is-heavily-barbed-t7194.html

题目：巨噬细胞是在小鼠和其他哺乳动物的免疫系统对细菌等侵入性生物起作用的细胞中发挥作用的细胞。 与其他小鼠不同，当感染细菌时，遗传上不能制造这些特定细胞的小鼠不会显示硝酸盐水平升高。


a无法制造巨噬细胞或使其数量充足的小鼠会以其他方式保护自己免受细菌感染

b显示硝酸盐水平升高的小鼠很容易抵抗大多数类型的细菌感染。

c在小鼠中，巨噬细胞在硝酸盐的产生或抑制硝酸盐被分解或以其他方式消除的过程中起作用。

d当健康的小鼠感染侵入性生物体时，小鼠体内巨噬细胞的数量减少。

e向缺乏巨噬细胞的小鼠注射硝酸盐不会增强这些动物免疫系统抵抗感染的能力。

实在是看不清关系……机翻看中文，觉得B应该错在“有M”=“容易抗感染“，虽然的确是这样但是题中没说