原文Thus a national-level analysis can understate the true legitimation and competitive forces as well as the number of foundings in an industry that is internationally integrated. 选D

难题！
学习这个表达： has four times the tensile strength of steel

主要是忽略了 what 后面的appear 应该用appears。我有一个小疑问 D的from，是不是可一看做既能修饰found 也能修饰bones，那是不是有歧义呢

c项 it没有可以指代的名词

之前花11000现在新的技术C花12500比较贵，所以不采用，weaken
削弱说明之前的11000有额外的花费
C中说跌倒会引起长期疼痛，长期疼痛所花的钱不在11000中，所以把说明真实花费比11000贵。

the total amount of pollutant emitted annually by vehicles at the O'hare International airport
is twice
that emitted annually by all...

难题，句子超级复杂。。。要猜测句意
CD错在形式主语和Remember的时态不对，应该是was remembered..
AB非常混论

主语是airline所以应该用than it did in...排除AC；看both and排除BE

原文没有提及教育背景，最后一句说了wage也是精准计算工资并没有说测定收入，但是B我没看懂，题目中说的是每个individuals没有说in addition to head of the household，这个是从哪来的

ABC都是形式主语问题，D是时态问题

题目说了是和死亡率有关，然后又说两个时段的群体不一样大，说明肯定是小的时候因为死亡率高，就要找死亡率高是为什么，就选E，有蛇捕食他们

谁被Ajusted...形式主语问题

n general, if you get to pick between the apostrophe+s construction and the "of" construction, and the possessor isn't a living thing, i'd go with the latter.
but by all means try to eliminate based on other things first.
"unqualifying" means "not meeting some sort of standard for qualification"
"unqualified", which means "without any sort of restriction or reservation".

“这个正确选项真是直白到有点让人不敢选 ”

there's also the problem with "if [participle]" -- a modifier that, by convention, refers to the SUBJECT of the sentence (not the proximate noun).
for instance:
Animal 1 will attack animal 2 if injected with enough of the hormones related to aggression.
--> in this sentence it is animal 1, not animal 2, that is being injected with hormones.

重要！！！
1）时态（因此不选D），很少会考到时态，除了对完成时态敏感，还要对过去时态敏感！
2）过去式/Ing定语短语修饰对象的问题，因此不选B

本选项的错误是现在分词短语burning down individual trees和denude事件不平行。

排除后只能选A或者D，may prove even more...than...political opposition (do)，所以A错

为什么the grassy fields and old pastures和sandpipers' vanishing不能比较呢？是从词意上不能比较，还是说语法上后者是复杂动名词，不能和名词平行呢？

A项 if you write "the sandpipers vanishing", then "sandpipers" is the subject ("vanishing" is a modifier describing that subject). the subject "sandpipers" doesn't agree with the singular verb "is".