R：the air quality of las vegas in 2007 was higher than that in 1997
W: the air quality of las vegas was higher in 2007 than that in 1997，前面部分的名词和in 2007之间被谓语动词隔开了，后面that in 1997却没有这样一个动词
R：the air quality of las vegas was higher in 2007 than in 1997，it指代the air quality of las Vegas，两部分时态一致，动词可以省略
R：the air quality of las vegas was higher in 2007 than it was in 1997

这是东西t 。。 说了跟没说一样

C：projected 可以修饰 consumer spending，consumer spending不能用在increase前面
ABD：核心词应该是increase，不是projection，也不是consumer spending

ce区别在于end的实然和将然状态，C正解的coming to an end 是一个状态，动态（变化中）符合产量增长放缓（变化动态），更贴文意。 增长放缓的原因是农业高速增长期要来了，而不是已经来了（所以不是end).

三组平行修饰opinion……差中选优就是A。。。Ideally, there should have been an and; however, this is just an acceptable writing style, especially used to emphasize attributes.

个人的想法不知道对不对

设A 为：provide support to Mr.Q; B 为：not Q& R
M说了： If A, then B
S说了： not B
结论：not A, 也就是not provide support to Mr.Q

或者可以用画图法
根据M 说法：P为一个大圆，里面有两个小圆，分别是1) Q but not R; 2) R but not Q -----2)情况符合答案B：在P 里，但not Q

我老是喜欢加入自己的常识认知。。。

An important thing to observe here is the usage of “each other” and “one another”. These expressions are used to show reciprocal actions. Take these simple examples:

a. Laurel and Hardy love each other.
This sentence means that Laurel loves Hardy. And Hardy loves Laurel. So here we have reciprocal action here.

b. All the cartoon characters start fighting with one another towards the end of the show.
This sentence means that one cartoon character was fighting with every other character. Here to the action is reciprocal.

However, the original meaning of the sentence does not intend to express reciprocal actions. It actually compares all the producing firms with one another. On this basis, choices A and C can be eliminated for incorrect use of “each other” and “one another”.

"to ___" —> same timeframe as the larger sentence/context in which it appears

"to have ___ed" —> earlier than the timeframe of the larger sentence/context

E.g.,

You appear to be injured. (It seems that you're injured right now.)
vs.
You appear to have been injured at work. (You may still be hurt; you may be OK now. The injury happened earlier.)

The Neanderthals don't exist anymore—and the main sentence is in the present (it's about what appears to be the case NOW)—so we definitely need "to have ___".

do something to do 目的修饰手段
n. that do

ever before 后要用完成时

over the past xxx yrs ---现在完成时

think of something as something---correct
think of something as + adj. ---incorrect

目的修饰手段 ，动作发生者须一致

主语不能简单与谓语用逗号隔开

类比推理

47*9+2+6不是+26

GMAT中like可以和such as 一样用来举例的！！！！
D是错在but it is和前面的not 不平行， not... but..

题目看清楚呀

归纳不是加强！