感觉C是正确的， which boosts consumption是非限定性定语从句，高中就学过非限 which可以指代从句或者整个主句，在这里指代it will stimulate demand by increasing supply and lowering prices 这个句子, 在逻辑和语意和语法上都对。
感觉A 是错的， improved efficiency in converting harvested trees into wood products 是指在做..采伐树木转化为木制品...事过程中提高效率 ，限制缩小了范围，感觉和降低harvest rates 构不成逻辑关系。
A 里的 用of doing 表示 做..采伐树木转化为木制品..的效率提高， 降低harvest rates 语意是对的。
谁能解释一下C 的理解哪里错了？

number/numbers: 表示某物的数量，可以说the number of sth，也可以说number/numbers。如： Los Angeles has a higher number of family dwellings per capita than does any other large city. 这里用number不用numbers，因为每户的住房面积是一个数字而不是很多歌数字。 Upset by the recent downturn in production numbers during the first half of the year, the board of directors, at its quarterly meeting, raised the possibility of adding worker incentives. 因为每个公司的生产指标有很多，所以用复数形式的production numbers.

某物的数量到底是多还是少并不清楚时，倾向于用numbers，如： In Scotland, the wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish’s habitat.三文鱼的数量虽然是一个数字，也用了numbers。 The gyrfalcon, an Arctic bird of prey, has survived a close brush with (A) extinction; its numbers are now five-times greater than when the use of DDT was sharply restricted in the early 1970’s.北极鸟的数量用了numbers

"instead of" contains "of", which should be followed by a noun. so, "instead of" should be followed by a noun (or by something that acts as a noun, such as some -ing forms).

on the other hand, "rather than" can connect just about any two similarly structured things.
nouns: I decided to purchase a truck rather than a car.
adjectives: I wish this transmission were manual, rather than automatic.
etc.
also, it can connect things that aren't technically the same grammatically but that play the same grammatical role. e.g.
it's best to read the passages quickly, rather than with precise attention to every little detail.
--> here, both the adverb "quickly" and the modifier "with precise attention..." modify the action of reading the passages. so, all good.

there's also a very slight difference in meaning. I'll bet you 99.99% that gmac will never actually test this, but ...
... "X instead of Y" means that "Y" was some sort of default / assumed/preferred outcome, but that X has been substituted for it.
... "X rather than Y" indicates no such preference; it just means that there were options X and Y, and, this time, X won.

e.g.
He paid with a check rather than cash.
--> He had two options, and chose the check.

He paid with a check instead of cash.
--> He was supposed to pay in cash, but he paid with a check.

again, the likelihood that this will ever actually be tested is pretty much nil, but, there it is.

ask beg intend order urge require这些既可以加to do又可以that sb (should) do sth

rob the oysters there of their flavor和make them smaller ...的不是increasing demands，而是盐度变化，应该用独立主格来表示这种影响。

A which用法错误
B it指代作物
C rob的主语是increasing demands，错误
E and making them decrease in size前面不要逗号

in spite of/despite表示转折，whereas表示对比，应该要用whereas， 排除AB

A in despite of错误，要用in spite of / despite
B previously的位置错误，that从句的时态错误，要用过去完成时
时态错误，排除CD，而且CD没有跟前面形成对比，应该是1940s, popular magazines ...., whereas previously these publications ....

主语是increases，复数，A的谓语动词用的单数，排除。
DE，缺乏谓语，排除，剩下BC
B在分号后面的部分不是一个完整的句子，排除

including后面要用and表示列举，排除AB
C里边要用such as，不能用as
E是from ... to...

digging in sediments的是scientists，排除AB
evidence是一个具体的“事件”，而不是某一个名词。
C suggesting的是一个具体的“事件“（that...）
D和E suggest的都只是“emergence”

这题排除法可做出来

E. In the sentence in which Pierre is mentioned, the author of the passage does not endorse criticism suggesting that Melville's works are romances rather than novels.

A. 32‾√=18‾‾‾√32=18

B. 23‾√=12‾‾‾√23=12, which is less than A.

C. 43‾√5=0.83‾√435=0.83, which is less than B.

D. 52‾√4=1.252‾√524=1.252, which is less than A.

E. 73‾√=493‾‾‾√≈16.33‾‾‾‾‾√73=493≈16.33, which is less than A.

等差数列求项数

N=0.5X, W=0.48X, N/W =1.04

三月0.94，五月1.0098

Since A, B and C are squares with area as 144, 81 and 225, the side in each case is 12, 9 and 15. Note that the sides are in the ratio 3:4:5.
So X must be a right triangle.
Area X = (1/2)*12*9 = 54

substitute k and x out.

K=5T
X=5-T

记得以前OG上也做到一道关于plan成功预测的。选项同样也是预测会…… VS 另外一个城市采用同样的方案成功了。选了后者。前者错在重复前提，预测会发生的事情毕竟没有已发生的事实来得有说服力。