首先是两大类之间的交换，其次是用on the one hand ... on the other 来合理的分隔这两大类，来避免歧义

这是我自己的理解，望大神解惑：
直接通过题干就能得到y=1，所以无论r^2=25 或者r=5 都是不需要的条件，所以选E？

续：

官方解释：

C. The comparative expression to a lower amount is unnecessarily wordy. The pastperfect form had reduced would make the temporal relationships somewhat clearer
than does the past tense reduced.
D. The present-perfect participial phrase, having blocked . . . streams, should be set off
in commas; as it stands, it does not make sense. The past-perfect form had reduced
would make the temporal relationships somewhat clearer than does the past tense
reduced.

Y will happen, only if X happens

the cheif 啥啥是插入语？

第一错为什么？

gmat出对比的SC题，果然喜欢用"like"和"unlike"的答案啊。。。

"as was the case" isn't a pronoun, so it doesn't refer just to a single noun. It can refer to an entire clause.

如果问题是net profit是多少，答案会不会不同？

BCDE都没有提到auditor

想问b为什么不行，觉得有排除掉海豹导致otter下降这一原因啊

看到prep12的某版解释为：C.The construction “skills bring out a disinclination in many people” is wordy, awkward, and idiomatically incorrect.

C的错误在于those of United States的those无所指代，因为后面是parts of rains，如果those指parts那么逻辑语义上便不对了

This argument assumes that magnetic fields in homes far from the fines do not cause health problems and that people who live near the fines do not spend much time within a few feet of them. Therefore, look for an answer option that indicates whether one or both of these assumptions is correct.

Reasoning：What additional evidence would most help determine whether magnetic fields from high-voltage power lines cause health problems for people who live near the lines? The public health official argues that power lines’ magnetic fields
probably do not cause health problems beyond a few feet from the lines, because those magnetic fields are weaker than magnetic fields usually are in homes far from such fines.

试着理解一下吧：分词和句子之间没有逗号隔开，那么一定是做定语且为限制性定语。如果有逗号隔开，那么优先考虑作状语，前提是状语中的动作要先于或者与主句动作同时发生。如果不满足，考虑是否为非限定性定语。
不知道这样理解是否可以~~~欢迎大家讨论补充！！

机场官员：本地居民抱怨到P地的晚班飞机打扰睡眠，应该减少晚班飞机数。 此抱怨是无理的---晚班飞机20年前就有了，这些居民买房子时就应该考虑好
假设题
A. 晚班飞机现在比以前少； 无关，排
B. 抱怨的居民住在房子里少于20年；取反即抱怨的居民住房子里超过20年，也就是说在机场建好前就住那里了，从而无法考虑机场因素，削弱原文推论，正确
C. 抱怨的居民忽视了机场的好处；无关，排
D. 机场经济成功依靠晚班飞机；无关，排
E. 在P地买房子的人都避免买靠近机场的房子；取反无法削弱，排

and 和 as well as一同出现表并列，这也可以吗? 那as well as 算什么结构?