设：1933年开始salary是S, fringe-benefit是F. 总Cost:S+F
1933期间，salary是1.03S, fringe-benefit是1.055F. 总Cost:1.03S+1.055F
因此：1.035(S+F)=1.03S+1.055F
S=4F
1933年开始总Cost: S+F=5F
F 成本占总成本的百分比：F/5F=20%

这个题有难度……我觉得纠结点并不是smooth和smoothly有什么区别，看英文解释：
adverb: smooth
in a way that is without difficulties.
"the course of true love never did run smooth"
而smoothly的副词则还有in a smooth way的意思，所以我觉得纠结这个……基本上想做出题是没戏了。

首先这个句子的意思是：自打19世纪40年代以来，飞机制造厂就致力于制造一种无摩擦的机翼；而打造的如此光滑，如此完美的机翼可以让经过机翼的气流不会变的颠簸了。
我觉得主要问题在于后半句的这个形容其实并非完全直接在形容frictionless wings，而是单纯说有这样属性的机翼有什么好处。

当然我觉得我上考场十有八九会选A。。。

大致句意：在拒绝了皇家训狗中心（声称）自家俱乐部的营业目标是教人如何训练狗狗的辩词后，法院决议该训狗中心并不能作为教育组织来免税。
A：一般非人的名词表示XXX的XX的时候，最好用of结构；其次，ruled the club ineligible句意不完整
B：in rejecting意思有变，但主要问题是their指代错误，这里应该是指代的是Dog Training Club
C: correct. 修正了A的物主结构表达问题，同时rule的宾语用从句表达清晰完整
D：主义ruled此时变成了整一个修饰，修饰education group，句意错误；
E：错误同B，rejecting这里出现意思也错了。V-ing放在后半句一般有和主句同时发生或者主句结束后立即发生的意思，而这里应当是先拒绝，才能决定其不符合免税资格。

read about (someone or something)
To glean information about someone or something by reading something.
I'm reading about Abraham Lincoln, at the moment.
I remember reading about a that in a magazine a few years ago.

read of (someone or something)
To have knowledge of be familiar with someone or something as a result of reading about them or it (in something).
I read of his research in a science magazine.
Most people have read of her at some point or another.

就是搭配考察。。。Neither...nor排除D；
Preoccupied with/ curious about排除 A, C
E选项it指代不明，这里应该指代reasons

pay attention to the words used in the question —— support for the 'position' —— so we don't have to strengthen the reasoning process

only D gives directly the advantages of dwarf varieties

实际上是比较对象问题，而不是XX cause earthquake的错误，因为caused作为一个从句明显是修饰Earchquake的。
先要理解句意，才能明白怎么解题：地震造成了Port Royal沉入了加勒比海（这件事的）影响，就像是火山喷发掩埋了Pompeii的影响一样：每个案例（发生后）文明都被冻结了一段时间。
所以要么比较两种自然灾害，要么比较两种现象的影响；
所以只有D符合要求

大致句意：与玩具市场合作的电视节目，曾经一度是被联邦法则禁止的，现在却被允许了而且发展的很好。
A：which was 修饰对象错误，这里应该是说这前面这一整个部分是被禁止的；
B：主谓一致错误
C：Developing TV programs is thriving整个意思就错了
D：they指代不明，是regulations还是programs？
E：正确。

b是因为it is for them错了吗

Note that not all nonsmokers are healthy in every respect. This raises the possibility that tobacco-smoke exposure of some nonsmokers—those who already have some medical condition—could either worsen existing illnesses or cause new ones such as lung cancer or heart disease.

read of 读到 了解到

我貌似找到答案了：B. Correct. The first boldfaced portion is not a conclusion; it is merely an assertion that is not supported by any claims presented in the argument. This portion, along with the statement immediately following it, are offered in support of the second boldfaced portion. This second boldfaced portion is the argument's main conclusion.

smoothly是平稳熟练地有歧义

and so可以连用

are paying在gmat里只有现在进行时的意思，而这里这个现在进行时是没有任何意义的

等边三角形内嵌在一个圆形里面，直径=2/3的高

题目已知x+y=1 y=1-x

in addition to可以加在主句的任何成分上，不仅是主语