在AC当中纠结，最后排除C选项的原因是C中的逻辑主语是BY 后面的 analysts, 比较的对象就变成了现在的economy和 analysts have thought 的 economy进行了比较，在逻辑上面说不通。因为have thought 是一个只有起点没有终点的时间观点，对现在有影响，因而无法进行比较。

设改变前weight1=100, 则改变后weight2=80, price恒定为100
(100/80-100/100)/(100/100)*100%=25%

利用恒等量：
0.1x+0.02y=0.05z=0.05(x+y)
(1) y=10
0.1x+0.02*10=0.05(x+10)
(2) z=16, y=16-x
0.1x+0.02(16-x)=0.05*16

第一遍始终没看懂suggests对应的是哪个单数名词，第二次做终于看懂是blending，， blending suggests her range and depth

A 中that of 指代不明，可以指代goal也可以指代majority
正确的平行是is still a goal of a majority of young adults, as it was (a goal) of earlier generations

毕老师，为什么a的reducing是伴随状语，而不是event的定语呢？

Therefore, the total amount of tax Jill paid was (0.04)(0.5T) + (0.08)(0.3T) = 0.02T + 0.024T = 0.044T. The tax as a percent of the total amount Jill spent, excluding taxes, was4.4%

Let T represent the total amount Jill spent, excluding taxes. Jill paid a 4% tax on the clothing she bought, which accounted for 50% of the total amount she spent, and so the tax she paid on the clothing was (0.04)(0.5T). Jill paid an 8% tax on the other items she bought, which accounted for 30% of the total amount she spent, and so the tax she paid on the other items was (0.08)(0.3T).

（4*0.5+3*0.8）%=4.4%

doubt是名词，这里是不是过完，是两个一般过去时

bossy+that的命令性虚拟语气，should要省略

http://fanyi.baidu.com/?aldtype=85&keyfrom=alading&mod=sample#en/zh/presuming
看了很多例句之后发现，presuming这个从句貌似不需要修饰主句主语，后面接句子（that可省略），用法类似于if

平行+核心词

注意独立主格的形式：with XXX ing或者by ‘s ing

presuming的逻辑主语是those traces

注意B选项both and 对象不平行

(1) m - 3z > 0. Insufficient on its own.
(2) 4z - m > 0. Insufficient on its own.

(1)+(2) Remember we can add inequalities with the sign in the same direction --> \(m-3z+4z-m>0\) --> \(z>0\), so \(z\) is positive. From (1) \(m>3z=positive\), so \(m\) is positive too (\(m\) is more than some positive number \(3z\), so it's positive) --> \(m+z=positive+positive>0\). Sufficient.

感觉E说的主动形式比D中的被动更能体现exhibit这个动作的实施者

A.this指代不明
B.主句缺谓语
C.主从句的关系，因果，不是The honeybee's stinger导致blablabla的，而是honeybee's stinger is heavily barbed and stays where it is inserted这件事导致的
D.同C，没有表现因果逻辑

in general, "X's rate of Y" is preferred to "the rate of X's Y".
for instance, salesman X's rate of success is better than the rate of salesman X's success.
"Mideast immigrants" is wrong; "immigrants from the Mideast" is better. ("Mideast" can't be used as an adjective of nationality, for the same reason you can't say "Asia people" in place of "people from Asia".)