这个题出的很棒啊！！虽然最开始没有反应过来C为什么对 但是选对了...
注意：题目中说的是 the average age at death，平均死亡年龄，如果W这个地方有很大比例的人都是在中老年的时候才搬来的，自然就将平均死亡年龄拉高了（去平均了那一部分早死的人）

奇数的平方被4除余1.
偶数的平方能被4整除

问题为1～n的乘积为990的倍数，因此可得1*2*3*4*5*6*7*8*（9*10*11）*12*13...求n的最小值，那么括号里是构成990的要素，那么至少n为11才能完成。所以答案为C

注意：B选项是在解释一个目前已经执行了的决策所产生的后果的原因，是在陈述一个事实，并没有弥补题目的gap
但是题目说的是 之后的决策 能否达到某一个目的 所以B是不ok的
而且在①期改进完成后如果就已经是few管理人员觉得决策可以被低一级的人完成 了，那么②期改进也无法带来巨大的进步啊

而且 这道题的gap是：②期改进（决策权下放）==》提高productivity，那答案肯定就要说下放了决策权之后是如何提高生产力的

来自cd：
B: In 35 years 表示将来，改变了句意；since releasing 是介词+分词结构，分词逻辑主语不对；
C: in the 35 years 如果表示一段时间，应该加past, last等等；since替代了after改变句子原意，release这个动作没持续到migrated开始
用完成时：“have/had done…since did”，没见过have/had done…since have/had been done 的结构出现过.

错选C
grow 而且还是naturally 应该是一个主动的状态

DE的时态首先就是不对的 既然是records 就应该是did not pay back their...

D选项：三个奇数相加减=odd（1+3+5=9，是奇数）
E选项：x^2+1=odd+odd=even，再加一个even=2x，则和为even，因此错误

设想直角梯形：角A、角B=90°，角C=45°，角D=135°，此时angle ABC is twice the degree measure of angle BCD，但是这里没有出现60°的角，因此条件1+2也不能推出

I understand that we can use "SUCH A NOUN" only when NOUN exists in an early place.

"such a group" in E is wrong because there is no word " group" in the early part of the sentence

the following must be correct:
I like the group of students and such a group can be a good community

E还有一个错的点
as long as you mention some specific "X" earlier in the sentence, then "such an X" is fine, yes.

another example:
i have no problem with using a standard geometry textbook; indeed, such a book is helpful in providing ready-made sets of practice problems.
--> "such a book" is legitimate because the sentence has mentioned a particular book (namely, a standard geometry textbook).
such + noun 中的noun一定要在前文中出现过

for instance:
i took a picture of dolphins frolicking in the surf --> correct, since the picture was of dolphins (not "of frolicking")

the consumers' HAVING the power is the actual thesis, not the consumers themselves, so "of consumers having" is wrong.

(a) and (b), "having the power..." is an -ing modifier that's not followed by a comma. therefore, it's a modifier that serves as an adjective, modifying the immediately preceding noun (= "consumers").
- since it's a modifier - can be omitted from the basic structure of the sentence, leaving behind the following skeleton:
...with the simple thesis of consumers.
consumers aren't a thesis.

E.g.,
We need 30 grams of salicylic acid to make the desired amount of medicine. (actual component of the process)
We need to build a larger laboratory so that our chemists can make / in order to make the desired amount of medicine.

A："So that..." is more properly used for actions that make possible or facilitate other actions, but are NOT actual components of those actions.
"so that..." should introduce a clause with a different subject. If the subject is still the same, then "in order to..." is a more efficient expression.

BCE时态问题

做题的时候在BC里纠结了一下，其实B错的还是很明显的
把and之后的部分对应到前面发现没有主语可以连接 jacket's stinger并不能can use it...
至于DE：Ron：
"Whereas" already implies that you're drawing a contrast between two different situations. So, "whereas" + "in comparison" = redundant.

AB中的it非常的ambiguous

(C) When Henry VIII's ship Mary Rose, which sank in 1545, was recovered in 1982, archaeologists found more than 17,000 artifacts on board,
选项错了8