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.

区分两个物种这件事情一直在进行，现在只是提供支持，并没有改变动作的状态（发生或终止），不能用to do

unequaled adj.无与伦比的，与D选项的highest替换

定语从句中用who，还是whom？
定语从句中,whom只能在从句中充当宾语成分,who既可当主语又可当宾语。但是若是介词后的宾语,只能用whom而不能用who.
R：There is nobody who/whom he can turn to for help.
W：There is nobody to whom he can turn for help.