错选A，无关项。
因果。

2^50 *50! 可被1-50所有数整除， 那加了1，prime factor肯定只会比50大，没道理比50还小；consecutive integers can't share ANY primes！

这道题搞清楚A: canceled projects 和 B: wasteful projects 不一样 很重要。A是B的一个子集。比如说 A=100, B=200，B可以认为是report中认为是wasteful的，而A是真正被取消的，包含在B中。
原文中说90%的A是在opposition party, 也就是说一共有90个opposition party的project被cancel，同理，有10个president party的project被cancel。在这样的情况下（一方被cancel很多而另一方较少），要说明cancellation是公平的，没有对party的偏见，就要说明opposition party大部分都是wasteful所以才被cancel了这么多，而president的并没有很多wasteful project。 这也就是B选项所说的。

the problem with A选项 is that the adjectival Modifier is wrong here, it reads as if the Taste Test is Conducted WITH the awareness. So it seems as if the opening modifier is modifying the test not the companies.

D is better as clearly states that the Companies are AWARE of X and Y

错选C选项：反而增强了

直接用选项给的三个数字减去2+5， 得来的数字都不满足 两边之和大于第三边

less表示smaller in size, amount, degree....
lower是higher的对立面

costs rose 2.8 percent in X, less than costs rose in Y.

这里后面的costs rose和前面完全一致，所以可以改写成

costs rose 2.8 percent in X, less than they did in Y.

陷阱： R=price*quantity, 条件1只说了quantity的具体变量，没有说price,但不代表price是不变的；同理，条件2只说了价格； 所以2个条件都insufficient；
再来，条件1+2, 没法得出纯数字比例，insufficient。

E选项的错误是，the last day that they are scheduled to collect' means, literally, that the workers collect days。。。collect days? .... that doesn't make a lot of sense.
RON 的忠告：do not read the sentences very literally, like a robot , instead, use 'common sense' to justify improper, inaccurate, or ambiguous wording.

为啥是they are?不是they were

5!/5, 5个人随便坐=5！，因为是圆桌，那么会同一个顺序会出现5次，比如BACDE, CDEBA, DEBAC, and EBACD are all the same outcome as ACDEB，所以5！/5

初始公式：r = kA^2 / B, Bdouble后 r = kA^2 / 2B， 维持不变， A也要乘以2才能上下抵消，平方1.4=1.96, 平方1.5=2.25， 明显1.4更接近2

毕老师求助！我本来是看懂觉得B ok了，但是我试图想用类比推理，根据for example 那句找，又感觉C好像也可以的？老师帮帮看看是哪里想偏了。。。O.O
for example 那句基于textile manufacturing in Brazil and Mexico ，看impact on this Latin American industry；这样看好像C的结构上更搭一点。。

some had automatic transmission and some had antilock brakes. 这句话只是想说车有T/B两种装备，没有表达T、B之间没有交集。

没选E是因为，water conservation也没说是什么方向的科技啊？如果还是容易蒸发，那不是还是老样子？

1. y(3y + 7) = x , y is an interger, so 3y+7 is an interger, sufficient;
2. x(x - 1) is a multiple of y ,x(x - 1) is a multiple of y
-- could mean any of 3 things:
possibility a) x is a multiple of y
possibility b) x - 1 is a multiple of y
possibility c) neither x nor x - 1 is a multiple of y, but together they contain all the prime factors of y (e.g., x = 3, x - 1 = 2, y = 6)
insufficient, because we don't know whether it's possibility (a) or not

between1 and 2 standard deviations below the mean： 21-6*2 < P < 21-6

这题有难题啊，逻辑弯绕不过来啊！这题即使看到选项A正确，我也好难架桥啊！

原来这题不是结论提，我一直按照结论提去做；死也做不出来

缺少一个班级总人数的条件。