C中they are unable to be distinguished, 能力在economic shifts。而实际上应该是人有没有这个ability，indistinguishable是说人无法distinguish它

there is no reason to use both "probably" and "estimated".
....and surpass China as the world's most populous nation
this is something that clearly must have 'india' as its subject.
i.e., this sentence will not work unless it says that India will xxxxxxx and surpass China...
看到and, 找平行！

这里的lighter或less可以作为一个排除的点吗？

题目要求考虑的是质量因素，所以d选项不能够削弱

mark!

第二次错了！反问一下A中“they”和“their”有指代对象吗？！

无脑选B,虽然犹豫了一下！
It is used in making a "more than" type of comparison where you also want to refer to a previously stated verb / action (that's where the "so" comes in). In this case, the "so" refers to "reported high marital satisfaction."
Notice here that you are comparing two groups of women: those who take new jobs, and those who retire completely. When making a comparison, you have to make sure you explicitly mention both groups.
In fact, B and D change the original meaning of the sentence to make the second part of the comparison a hypothetical - but the original meaning is that the ones who take new jobs are being compared to those who don't.
for comparisons, they two things / groups / whatever compared should be parallel. "women who took" and "those who retired" are parallel.

选项c，in dong 正在做的事情，和人口没有关系

Because there is only one category mentioned (sense of smell) I think the word "difference" is appropriate.
more……as 错；more than/higher than/greater than 对

"even as" is a transition used to imply simultaneity, and is usually used with parallel tenses (i.e., same tense in both parts of the parallel structure). 主句从句的时态要保持一致;这里更需要用although表转折！
here's an example: even as his income has increased, joe has continued to feel less and less satisfied with his life.
比较C和E，C: HCa‘s fairy tales （have been among）……, still his plays，…，and travel books （remain） almost unknown outside.
E: Although HCA wrote fairy tales that (are among)……，his plays……and travel books （remain） ……
* first, the tenses should be parallel, since the descriptions are meant to be simultaneous.
* second, they should be the present tense, since the sentence is stating facts that are statistical truths.

我怀疑这答案有问题，不可能才500

B vs.D:用定语从句修饰同位语优于用伴随状语修饰，后者有明显的正在发生的倾向；
关于expect的固定搭配： expect to do…/sth. is expected to do…/…expect that sth. will do /it is expected that sth. will do /eg. Inflation rose more than we expected. /There is an expectation that……
WRONG：sth. is expected for it to do./ It is expected that sth.should do.

非限定性定语从句里which不是可以指代整个句子吗

原本M说：如果P和Q有交集，那么Q和R就没有交集；然而S推翻了M的说法，S说Q和R是有交集的，那也就是说P和Q没有交集咯，所以B对。。。。。。

个人认为E选项的条件句如果是 if it did so应该也没问题吧？
相比较而言。if it were to do， 强调主句潜在的结果特别糟糕或不可想象，if it did so 则没有这个强调作用

只是这里不能用不定式短语做主语

B-写错了吧？！文中的意图是仅仅次于大豆。

C large in quantities 有歧义

目前想到最快的是用梯形面积减去两三角形。求更快方法

B里面的capacity是产能并不是产量，产能增加了也不会代表产量增加。比如能生产500t，不等于会生产500t