"using和by using。前者指的是campaign itself use；后者修饰强调的是how to organize，暗示主语是industry，组织的方式是用户网；显然前者对。
A have主谓不一致。
B 正确
C by using不行；in convincing不行
【s + clause + by VERBing】这个结构用by ING解释主句如何发生
例如 i prepared for the test by reviewing takeaways on the MGMAT forums. 看论坛解释了我如何准备考试
用在C选项里面就是使用网页等解释了行业如何举办活动，但真正的意思是活动自己使用网页等
【s + clause + IN VERBing】，那这个clause必须是VERBing的一部分，例如i solved all the problems in OG12 in preparing for the GMAT.解决问题是准备GMAT的一部分。翻译为【在这件事中】。
用在C选项里面表达的意思就是举办活动是convince政府的一部分，不合理
错选D as well as不可替代and，因为它是个修饰，有主次和从属。而语义是单纯并列。过去式也不对
E in convincing不行 过去式也不对"
理解significance：To assess the significance of a change in policy
Significance = the quality of being important(LONGMAN: especially because of the effects or influence it will have in the future)/the meaning of something
#这道题虽然设问在第一句但要结合第一段来分析，第二句和第三句明显在甩锅给historian，说明被作者喷的是historian而不是documents# #本质还在考判断作者的态度#
Ethnohistoric documents from sixteenth-century Mexico suggesting that weaving and cooking were the most common productive activities for Aztec women may lead modern historians to underestimate the value of women's contributions to Aztec society.
Since weaving and cooking #occurred mostly (but not entirely)# in a domestic setting, #modern historians are likely to apply# to the Aztec culture the modern Western distinction between "private" and "public" production. [说明了是historian的锅]
Thus, the ethnohistoric record conspires #with Western culture# to foster the view that women's production was not central to the demographic, economic, and political structures in sixteenth-century Mexico. [再次强调是因为western culture混进来导致的]
* the sentence openers starting with "with" are incorrect. to work properly, they'd have to be followed by a subject that's actually "with" those things.
example: with five all-state players in its backfield, ballard high looks to shut down opposing offenses completely --> this makes sense, because ballard high actually has five all-state players in its backfield, thus justifying the use of "with". there's no corresponding sense of possession / belonging here.
this kills (c) and (d).
问的是谁在posit，是researcher highlighted。In addition, the distinction between pheromones and odorants - chemicals that are consciously detected as odors-can be blurry, and some researchers classify pheromones as a type of odorant.
"namely" must be used either before a noun or before a noun phrase / clause. you can't use it directly before an independent clause. because of this principle, you can't say "namely they vary...". however, "namely that they vary..." and "namely considerable variation" are both fine. this kills (a) and (e). * "the fact of X doing Y" is universally incorrect. this kills (a).
A 双主语
B 缺少谓语动词
C 正确
D that was无论是指代method还是mineral都使得后面的as early as变成从句的成分，那就变成了method（或者mineral）was as early as the eighteenth century，显然说不通。
E 时态不对，过去完成时表示leaching是过去的办法，现在不用了，但句中并没有表述这种意思
A less 修饰不可数，且用less的话，前面要用there is
B 正确，没选是因为缺少一个as，实际上是省略用法
C amount修饰不可数名词，不能用来修饰4,000（drive-ins）这个可数的量
D the number指代不清；the amount指代不清，只能修饰不可数名词；the number is less没有问题，less和smaller都可以修饰数字。
E it没有指代对象，that amount指代4,000 drive-ins错。
Ron:that doesn't work, because "they know" isn't in the first part. if a construction can be omitted, then the same construction should exist elsewhere in the sentence. here, it doesn't; the omitted portion would be assumed to correspond to "demographers have to know", which doesn't make any sense.
题干想表达的意思是他们必须比现在知道的更多，但是如果省略they do意思就变成了必须比不得不知道的知道的更多，不合理，排除AE
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"BC and前面不是完整句子
DE 用ING做伴随状语错误
ING修饰语的两个作用：
1 与主句动作同时发生 当被修饰主句已经是完成时态，那么后面的现在分词本身就不可能再与主句动作发生在同一时刻，只可能行使伴随结果的功能
2 主句动作的即时结果 immediate consequence 收集了20年证据并不是得出结论的必然结果
所以DE都不对"