文章的逻辑：因为有些项目外包商完工成本低于我的完工成本，所以我把这些项目外包出去我的利润会增加。
这个逻辑是一个几乎没什么逻辑漏洞的逻辑，除非你说“寻找外包商没有很高的寻找成本”，或者“签外包协议没有很高的签署成本”等，不然的话这就是一个“保证性”的增强，即保证这个条件，结果顺利达成即可。
所以，A是在另一个方面重述条件，B无关，C选项就算我的外包商是否和我竞争不会影响到我的profit会上升这件事，因为我只要外包出去了，我的成本就会下降，我的利润就是会上升。D选项用的是价格投标的方式，这和我利润提升多少有关，并不和是否提升利润有关，因为文章已经告诉你了外包商的成本就是低。E选项是一个文章条件衍生出的一个他因，这个他因也能导致利润上升的结果，所以是增强，选e

错选E，主谓不一致，rates后面应该跟exceed

A选项代词they从语义上应该是指代robots机器人，后面their goal指代的是researchers的目标。代词的绝对性错误
D E and 和 as well as 前后不平行

所以Centerville是个地名，而不是一个和V一样的店名

Independent run for the presidency表示“独立竞选总统职位”，在意思上等同于independent candidacy

文章一上来就说黑死病has intrigued scholars，其学术观点的先后顺序是1.intensified the political and religious upheaval that ended the Middle Ages. 2. led survivors into the Renaissance and subsequent rise of modern Europe. 3. merely an ancillary factor contributing to a general agrarian crisis 4. astonishing mortality rates restored the central role of the Black Death in history. 5. The Black Death caused far less havoc and fewer deaths than historians typically claim. 这些学术一直都是围绕着黑死病的role在进行辩驳

动词die是点动词（所谓点动词，就是那些开始即完成的词），由于点动词根本就没有持续的时间，所以开始就意味着到达了终点，自然不可能用ing的形式。

Locate to--------------------Prior to Kerber’s work, educational historians barely mentioned women and girls; Thomas Woody’s 1929 work is the notable exception.

"proved" can also be an active-voice verb, especially in reference to descriptive qualities.
e.g.
John, who had always bragged the most about his fighting abilities, proved to be the most cowardly person in the group when actual threats arose.
or
my efforts proved insufficient, and i returned home without winning the prize.

currently possible可以指省略了名词的currently possible speeds,
that只能指代单数名词，复数名词用those；which可以指代复数名词

这里说的是H西红柿的性质，是主句内容，而不是宾语的同位语。
although做状语，修饰主句；but表转折，与主句并列，甚至意思上比前面的句子更突出；“但是更好吃”显然应该做“虽然不好看”的转折主句，而不是修饰从句。

这个but前的“，”决定了but后的内容并不是和substance的定语从句平行的

这道题真的纯靠语法选，要不然我感觉A的语义会更好一些......

"both rooted in... and in..." would still be non-parallel.
if "both" is followed by "rooted", then "and" MUST be followed by something parallel to "rooted".

Resource-based theory offers an answer, asserting that, in general, firms gain competitive advantages by accumulating resources that are economically valuable, relatively scarce, and not easily replicated. According to a recent study of retail firms, which confirmed that IT has become pervasive and relatively easy to acquire...这个是according to Resource-based theory原文的定位

seamstress 女裁缝师；原文定位 - Their guild was composed not of family units but of individual women who enjoyed unusual legal and economic privileges.

每一段的第一句话很重要，要重点读；The conflict between the guilds was not purely economic, however.

research and processes 不是复数吗

concede - to admit that something is true or correct, although you wish it were not true
（不得不）承认

Despite these changes, the authors maintain, the World Bank and the International Monetary Fund-the foremost international development institutions-have continued to promote the NIC path as the way for heavily indebted developing countries to proceed. And yet the futility of this approach should, according to the authors, be all too apparent so many years into a period of reduced growth in world markets.