E选项 曼哈顿说避免用Y of X‘s

C选项 主句：NB是一个记者，修饰语：这个人（主语） includes（谓语） circling（宾语）...in her exploits（宾补），语法没问题，但是语义上太绕了，直接像B一样说exploits includes circling就行了

气候变暖（A）还是人类迁徙（B）导致动物灭绝？原本意思A发生，B发生，所以C发生。到底是A导致的还是B导致的。

要证明是B发生导致的，而不是A发生导致的。
那么看一下：
要么A不发生，B发生，C发生；（把A改变一下，发现没影响。）
要么A发生，B不发生，C不发生。（把B改变一下，发现有影响，C选项就是这个意思。）

Just as … , so … Just as you sow, so you will reap
Just as … , as … Just as you sow, as you will reap
Just as … , so too … 主句要部分倒装(so too后是主句) Just as you sow, so too will you reap

为什么c选项不能看成with只接了companies 是个名词 而后面从句that修饰companies？

amounting to的用法没问题，但是逻辑主语是the price，这个是有问题的

amount

a的比较对象有问题，the price和cars and trucks不能比较，amounting to没问题

this sort of construction -- comma + "or" + noun -- is used when you have two equivalent formulations of something, and you are trying to introduce the fact that they are equivalent.
notice that this is not the usual use of "or" to indicate an option between two things; this is a special use of "or" to indicate a definition or equivalence.

应该是an=2an-1-x, a5=2a4-x, a4=2a3-x

假设红签长为R， W里的平均长为R+18， V里的平均长为R-6. （R+18)-(R-6)=24.

'remainder' and 'balance' mean 'the rest of the stuff'. in other words, these words exist specifically to convey the notion of 'NOT everything'.

The real problem with D is "the rest of the 9 inches". This construction implies that 9 inches is the total.
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).
the balance和the remainder表示的是余额

if you've got a fraction of NOUN or a percentage of NOUN, you retain the singular/plural nature of NOUN.
so, since "students" is clearly a plural noun, so is "x% of students". since "precipitation" is clearly a singular noun, "50% of the precipitation" would also be a singular noun.

choice e literally says that the usage of spices is 'in small quantities', which is not the proper message. this could mean that you don't use spices very often, but, when you do, you dump 14 kilos of allspice and 12 kilos of paprika in your pan.

C：
the usage is incorrect -- in fact, i don't think you can say "verbING is done..." for any verb.
the other problem with that answer choice is that "large quantities" doesn't seem to apply to the spices themselves, because the spices are no longer the subject of that construction.

1）Sequences of actions are normally in parallel. If two description happened at the same time, they shouldn't be parallel. Instead, use "comma + ing" to modify.
2）", then ing…" is NOT right, because the action of "comma + ing" is in the same time-frame as the main verb.

一个很简单但又容易错的题，GMAT的数学，细心再细心哈。-25，-24，-23，-22.。。。。22，23，（24是没有的）。

为什么这题考点不在主被动呀，B选项中使用被动形式就省略了动作合理发出者呀？