经验：不要凭借自己的理解，要回到原文找硬的证据！

看作者的tone的时候 要看主次，以及是否帽子cover全部内容。本文主要是Negative 但后来补充了一些positive的说明。比较选项来看只有最后一个比较保守谨慎的说明的这些。

ving 和 wh从句：跳跃和不跳跃
to do 和 doing：目的表达
代词

自动locate 代词以及先行词，看是否有指代，指代是否明确。

except题 第一次见 全都要看

娘的 这题考了好多次 不同的考法 都错了

v-ing做一个noun使用的时候 多多少少还是表示这点 the subject of sentence +v-ing的意味

感觉这个题用主谓一致排除了之后 剩下的都是靠两者之间不断地比较 一点点细微的优势 做出来的

(2) x< 100

解二元二次方程：
x*y = 24
6-x = 8-y

dimension n. 尺寸

for instance , that you arrived on time today was a surprise to everyone.
--> this is a correct sentence. in other words, you are normally late, and so the fact that you arrived on time was a surprise.
your arrival on time today was a surprise --> this isn't as good, because your arrival wasn't a surprise. the surprise was the fact that you actually showed up on time.

注意体会！是这个时间double了数量！
以及注意A的错点：the weirdness of the "that..." construction in (a) isn't grammatical. it's perfectly fine to use "that" + clause as the subject of a sentence, provided that you are trying to refer to some fact as an abstraction, rather than to an actual action.

save ¥50 in prevention 语义错 prevention不能用金钱衡量

C/D/E中补出of后逻辑意思错误：
The combination of X and Y，表意为X何Y两个元素的结合，逻辑意思正确。
The combination of X and (the combination) of Y，表意两个combination，但是单独的water supply/good growing conditions无法被称为combination，逻辑意思错误。

这道题错的非常典型！！
For the farmer who takes care to keep them cool, provided with high-energy feed, and milked regularly, Holstein cows will produce an average of 2,275 gallons of milk each per year.
keep them cool // keep them provided with... // keep them milked regularly ...!!!keep+v-ed/adj.
（理不清题目结构的时候还固执地按照一个方式去理解 只有做错！没有读懂本身意思或者不能准确解释题目含义的最后都只有做错！）

注意时态！！！一般现在时表示客观真理或一直以来都发生且将继续发生的事情，此处应该是完成时，表示从过去某时刻延续到现在的动作

even as无转折含义！！！

主句应该是想要强调工业主宰美国经济，而不是强调每八个人有一个被雇佣，错选b

在一个句子中，代词it如果反复出现，其必须指代同一个单数名词（they也是同样的道理）。本选项中it quickly replaces it显然是不正确的，这两个it在逻辑上应该指代不同对象。