比较时，省略的结构应该在前面可以找到对应的结构。所以E选项的charging在前面并没有出现，

题意：划线部分Progressive historians和scholar在哪点上会disagree有分歧
信息查找🔍：重点“Similarly, Louis Hartz, who sometimes disagreed with the Progressives, argued that Americans accepted laissez-faire capitalism without challenge because they lacked a feudal, precapitalist past.”similarly表明progressive historians也持有的是LF资本是without challenge的。但是scholar认为是有challenge。
所以双方是在关于LF资本是否收到challenge上有争议。
opposition→反对。

“RON: laissez-faire... was not accepted without struggle. Laissez-faire capitalism ...clashed with... norms
LZ met with resistance from these social "norms" before it became predominant所以Ａ選項 norms provided a primary source of opposition to the development of laissez-faire”

clashed with 与……冲突

E选项错误的原因在于： new household technologies do reduce the effort required to perform housework.
全文的意思是在强调new tech没有减少time spent on housework by full-time home workers

海洋学家认为缺少iron会影响浮游生物生长，要“反驳海洋学家是错的”的结论，也就是要指出这个experiment的缺陷。
题目的immediately其实是个信号词，对应了D的few days later. 几天后iron的那些物质就飘走了，那么添加的iron对浮游生物就没什么影响

poll中赞成扩建铁路系统的人认为，扩建了铁路系统，就会有更多的人去乘地铁，从而减少highway的congestion。但是，poll还显示，大家都是这么想的，所以没有“以为的人”去乘坐地铁，大家依然还是堵在high way上。

However, recognizing employers' power over workers as a central factor in African Americans' economic marginalization

错选了E

虽然提到了racial discrimination，但是没说hamper了

“画图法，（1）（2）分别代表两条直线某边的阴影，联立，则在第一象限，所以XY>0，选C”

“（1）即n=5a, t=5b, 问nt即25ab的最大质因数，但a或b都可以是比5大的质因数，比如7/11等，所以无法确定nt最大质因数； (2) n,t 只可能是3,5，7之一或二者或三者相乘，最大不超过105=3*5*7, （n或者t如果有一个超过了105， 那最小公倍数就不会是105），所以nt相乘最大的质因数就是7”

不知道beginning之后和取钱的这个期间是否有存钱。

回回做，回回错。关键是理解题意，画好辅助线。

the product of all the different positive prime factors of n 指的是n的所有“不同”的质因数的乘积 less than the square root of n
99 = 3*3*11 → 3*11 = 33 33的平方大于99 ×
98 = 2*7*7 → 2*7 = 14 14的平方大于98 ×
类推，96 = 2*2*2*2*2*3 = 2*3 = 6 6的平方小于96 √

对于estimate的用法，简单地讲：当age,cost,price,等为主语， 比如The price of the gadget is estimated at 10 $,这里The price of the gadget是The gadget的属性，可以用at/to be都行；如果属性的本体作主语——The gadget is estimated to be 10$，则只能用to be.

小结一下：属性作主语，则用estimate to/at都可以；本体做主语，则只能用estimate to-------> From CD

同时如果是一个范围，也就是10% less than这样的，只能用to be，不能用at，感觉at后面必须接某一个确定的数词

因为曼哈顿SC认为she estimates the cost to be 10% less than it was last year. 正确
she estimates the cost at 10% less than it was last year. 错误

但是看了朗文的词典，感觉接受度更高的还是estimate to be

https://www.ldoceonline.com/dictionary/estimate

除了个别情况，好像还有很多时候’s也适用于无生命的情况，比如gmat里面有company‘s research的用法出现在SC里面，所以最好还是不要把’s不能适用于无生命情况当做一个绝对判断标准吧，不然容易错失正确选项

题目说的是possible, 不是must be true
D：假设1990年的中雨的降水量全都是达到极限值2 inches，1910年中雨的降水量全都达到极限值1 inche，那么D的意思就是2*1990年天数>2*1*1910年天数，但是题目说的是1990年的天数是小于1910年的天数的，所以肯定不成立
A：大雨的日子更少，但是大雨的降水量可能是巨多的，因此possible

D changes the meaning by using although. This is saying that despite the fact that they can afford household appliances the labor is demanding, instead of saying whether or not they can afford the appliances the labor is demanding. Although shows that they definitely can, whereas even if shows that hypothetically can.

IMO, the more substantive route to solve this would be to sift whether ' would find' or 'would have found' is correct. There is no point in saying that the grandparents would find them a miracle in the coming future days. We must attribute their perception with what they would have felt in their on their own contemporaneous times.

Even if - means whether or not and has to do with the conditions that may apply.
1. Even if I had time, I wouldn't watch that programme.
2. Even if Mark told the truth, I wouldn't believe him.

Even though - Even though means despite the fact that and is a more emphatic version of though and although. It is primarily concesive
1. Even though I had time, I didn't watch that programme
2. Even though Mark told the truth, I didn't believe him.

The differences can be appreciated in this sentence
1. I'm going out, even if it rains
2. I'm going out, even though it's going to rain
We do not know whether it will rain or not in (1) so we use even if
In (2) we know that it is going to rain but we are going out anyway

为什么B选项中的with不能直接修饰stars?,with 不是就近修饰吗？

有重力补偿，就没有negative gravity anomalies,
题目说的有最明显的negative gravity anomalies的话，说明就没有重力补偿，所以要找到没有重力补偿是什么情况-->现在没有重力补偿了，但是在early in lunar history是有的

看清是shipping 还是processing！！！审题