1.句子结构，破折号内相当于是插入语，就算去掉，剩下部分也是完整的句子才对，而后半句已经是完整的句子了，前半句应该是修饰词，或者是从属从句，或者是带并列词的完整句子。
ACE没有谓语（或者说主语重复），直接排除。
D是一个完整的句子，但是前后两个都是完整的句子，却没有并列连接词，属于run-on错误，D错。
注意：分号可以连接两个完整的句子。
这里为啥要用破折号而不用逗号，破折号可以插入句子，表示是对前面的解释。但是两个逗号之间插入一个句子，就可能会导致语法结构错误。

C 中的and also也是赘余用法

A.the growth rate of real GDP per capita in 1997 would have surpassed the average growth rate of real GDP per capita between 1873 and 1973 because over fifty percent of the population worked for wages in 1997.按理说1997工作的人数多，GDP人均应该增长得快，A的因果错了
B.If the growth rate of labor productivity (output per hour of goods and services) in 1997 had equaled its average growth rate between 1873 and 1973 .也就是说labor productivity在1997这个时间段是减少了的，不是像B说的一样“增速变慢”，它根本没增
C.无关，GDP是商品创造的价值，跟工资多少没关系
D.正确。the real GDP per capita grew nearly one-half percent a year more slowly than it had on average between 1873 and 1973
E.不是吧不是吧？不会真有屑考生让1997自己比自己吧？（bushi

？？？以为inflation to remain是index was unlikely to continue going up的前提，结果题目居然不是千层饼？

应该是选c，否定一个肯定一个（说明不是瞎，而是需要rest，不然看到猎物都跑了，瞎的话是看不到的也不会突然加速了），b选项两种情况都不存在

这道题问的是如果研究者没有发现那两个species免于破损，会怎样
文中提到，研究者排除preservational bias，是因为a total absence of breakage in two extinct species
那这道题问的就是相反的情况，
因此，研究者不能草率排除preservational bias

相关因果，人均收入上涨→粮食产量不变，需求上升→需要进口粮食、肉

搭桥，即构成因果（其实取反比较好做）

A、种粮面积下降，无关
B、进口不会提高人均收入，无关
C、人均消耗肉与收入涨幅一致，与粮食无关
D、肉生产者收入增长更快，无关

E、粮食消耗上升不会减少肉的消耗，CORRECT；粮食需求上升不会导致肉需求下降

我觉得D与E，最根本的是表达意思不同，D的意思是说，想要拿钱的话就必须要等到最后一天。E的意思是要等到已经安排好的拿钱那天。 句子前后的对比可以看出d 是符合前后对比描述的。

老师，年代跨度大且不在一个月份的题怎么解呢？开头这题应该怎么解呢？

这道题的关键在于读懂题目，If k is a positive integer and the tens digit of k + 5 is 4, what is the tens digit... 给的是k+5的值的 tens digit是4...

第12题：
and so, 这里的so 是副词不是连词么？

There are several reasons to eliminate A and choose B.

so X as to Y implies that Y SEEMS TO BE TRUE.
Official examples:
Climatic shifts are so gradual as to be indistinguishable from ordinary fluctuations in the weather.
The features of the idealized sculpture portrait are so unrealistic as to constitute what one scholar calls an "artificial face."
In each case, the blue portion is something that SEEMS TO BE TRUE about the preceding subject in red.

so X that Y implies that Y ACTUALLY HAPPENS.
An official example:
Everyday life is so brisk that it hampers the ability of some children to distinguishing discrete sounds.
Here, the blue portion is something that ACTUALLY HAPPENS -- an action that is actually performed by the preceding subject in red.

A key difference between the two idioms:
Whereas in the second idiom Y can serve to express an actual action, in the first idiom it cannot.
In the first idiom, Y must serve to express not an actual action but merely something that SEEMS TO BE TRUE about the preceding subject.

A: so saturated with water as to acquire a liquid's character
Here, so X as to Y incorrectly serves to express the action in red.
As noted above, Y in this idiom must serve to express not an actual action but merely something that seems to be true about the preceding subject.

Moreover, the usage of so X as to Y implies that the portion in red does not actually happen.
Not the intended meaning.
A person can DROWN in quicksand.
Thus, quicksand actually DOES acquire the character of a liquid.
To express this meaning, we should use so X that Y, as in the OA:
"Quicksand"...is so saturated with water that it acquires the character of a liquid.

Another issue:

A dog's eyes can reveal much about its temperament.
Here, the phrase in blue implies that every dog has UNIQUE eyes -- eyes that can reveal much about the dog's temperament.

A: a liquid's character
This phrase seems to imply that every liquid has a UNIQUE character.
Not the intended meaning.
The intention here is to discuss the general nature of any given liquid.
The OA correctly expresses this meaning:
"Quicksand"... is so saturated with water that it acquires the character of a liquid.
Here, THE CHARACTER of a liquid = the general nature of any given liquid.

For all these reasons, eliminate A.

真的没有人错这道题吗嘤嘤嘤嘤嘤嘤嘤嘤嘤😭

BCD还没提到，排除；AD明显选D

profit=revenue+cost

（2）假设t=7k+m，发现m=1和6都能使t^2除以7余1，所以并不能确定m等于多少（当时忽视了m=6）

【转载】(1)d+1是偶的时候，c可奇可偶，不能确定，NS
(2)d+4是偶的时候，c+2可奇可偶，则c可奇可偶，不能确定，NS
(1)+(2): 当d+1是奇的时候，条件1说明c得是偶数，同时满足条件2；当d+1是偶的时候，d就是奇数，所以d+4也是奇数，要想满足条件2，所以c+2得是偶数，说明c得是偶数。因此能确定c一定是偶数，S。

E选项的解释不太认同。为什么the ones 不能指代主语Tides？the tides at the Bay of Fundy 是符合逻辑的。

倒装句，看了答案才明白

前提：然而，补助不会增加超过在没有被雇佣所得到的政府救济，换句人话就是补助不会多于政府救济。
结论：失业的人没有财务刺激来去申请补助。

预判： 1. 补助不会超过救济，会不会工作后工资会逐步增加，这样一来，工资加补助就会更多，从而更多人去申请补助。
2. 是不是财务刺激只是 补助这部分，如果财务刺激的来源还有找到工作后的收入。
3. 是不是还有找到工作后免税的财务刺激等。

看选项：

A.政府不收失业人资助的税，这个选项加强了结论，这样一来，失业的人更倾向拿失业救济，排出
B.隔壁国家修改了最低工资后失业率更高了，这里并没有说是增加了最低工资还是减低了最低工资
C.找到工作的人比失业的人收入更多，符合预判内容，保留
D. 失业的人得到的政府救济要比政府定义的贫困水平要的收入要少，这里提出了新的信息贫困水平的收入，救济的多少和政府补助没有关系。排出
E. 享受工作所以有时接受收入较少的工作， 无关选项。排出。

所以最优选应该是C