弄清楚谁是数的倍数，twice as many English majors as history majors，选英语的是历史的两倍，E=2H

第二句含义：只要耕种依然可行，农民就不会卖土地

算一个30天内帐户余额的平均数。
告诉你在最初时候帐户里有600块，然后这三十天中帐户唯一的变化就是某天用掉了300。

条件1就他说那个钱是第21天付的，那就直接（20×600＋10×300)/30。就是说前20天帐户里都是600块，后十天都是300块，算个平均就行了。
条件2说前25天的平均数是540。那说明那300块肯定是在前25天中的某天中付的，否则平均数应该是600。设 有x天用300；x 300+(25-x)600=25乘540 x=5 最后求出( 5*300+25*600 )/30
两个条件都能算。选d, either。

从第二种开始就要考虑前一种的情况了，不能想得太简单

服了自己了，B选项那么明显都没想到，有时候不能把题目想得太复杂

可以有可以没有，不充分

any pair of successive numbers 相邻的两个数，也就是等差数列

Plus, "this" is trying to operate as a pronoun here, and that's not OK -- "this" can only be an article, not a pronoun.Eliminate (E).

A: To begin by doing a certain thing means to do that thing first. Using both at first and begin is redundant. Eliminate answer (A). 比较选项A和B，at first位置不同，要思考有何差别

A选项：不要把非营利医院和政府画等号。

We've had some great discussion on this already, but let's see if we can break down HOW to answer this question in the quickest and easiest way we can! Before we dive in, here is the original question with the main differences between each option highlighted in orange:

Although Alice Walker published a number of essays, poetry collections, and stories during the 1970s, her third novel, The Color Purple, which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize.

(A) which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize
(B) published in 1982, bringing her the widest acclaim by winning both the National Book Award and the Pulitzer Prize
(C) published in 1982, brought her the widest acclaim, winning both the National Book Award and the Pulitzer Prize
(D) was published in 1982 and which, winning both the National Book Award and the Pulitzer Prize, brought her the widest acclaim
(E) was published in 1982, winning both the National Book Award as well as the Pulitzer Prize, and bringing her the widest acclaim

After taking a quick glance over the options, a few key differences stand out:

1. which was published / was published / published
2. and / as well as
3. brought / bringing

The best place to start is anything that will knock out either 2 or 3 answers right away, so let's work our way backwards on our list and start with #3: brought vs. bringing. This is clearly an issue with verbs, so let's determine which one is the best to use here.

To begin, we need to find the subject and verb. Here is the original sentence:

Although Alice Walker published a number of essays, poetry collections, and stories during the 1970s, her third novel, The Color Purple, which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize.

If we cross out all of the modifiers (and there are a few), we're left with this:

Although Alice Walker published a number of essays, poetry collections, and stories during the 1970s, her third novel, The Color Purple, which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize.

Once you take out the modifiers, which are mainly there to confuse readers, it's clear that the subject of the sentence is "The Color Purple." And what did The Color Purple do? It brought Alice Walker acclaim! Let's look over each option more carefully to figure out which ones use the right verb to match the subject. I'll still cross out any modifiers to help you see things more clearly.

(A) The Color Purple, which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize --> OK
(B) The Color Purple, published in 1982, bringing her the widest acclaim by winning both the National Book Award and the Pulitzer Prize --> WRONG
("The Color Purple bringing" isn't the right verb.)
(C) The Color Purple, published in 1982, brought her the widest acclaim, winning both the National Book Award and the Pulitzer Prize --> OK
(D) The Color Purple, was published in 1982 and which, winning both the National Book Award and the Pulitzer Prize, brought her the widest acclaim --> WRONG
(While this does use the correct verb "brought," it also tries to add another verb "was published" inside a modifier, which is a big no-no because it creates a comma splice! So, let's rule this one out too.)
(E) The Color Purple, was published in 1982, winning both the National Book Award as well as the Pulitzer Prize, and bringing her the widest acclaim --> WRONG
(This one is wrong because it uses the incorrect "bringing" and it has a comma splice before "was published.")

We can eliminate options B, D, & E because they use the wrong verbs or have comma splices. Now that we're left with only 2 options to choose from, let's tackle #2 on our list: as well as vs. and.

Whenever we see the word "both" joining two objects, those two objects MUST be joined by the word and:

Both X and Y = CORRECT
Both X as well as Y = WRONG

(A) which was published in 1982, brought her the widest acclaim in that it won both the National Book Award as well as the Pulitzer Prize
(C) published in 1982, brought her the widest acclaim, winning both the National Book Award and the Pulitzer Prize

There you go - option C is the correct choice because it uses the correct verb "brought" and uses the idiom "both X and Y" correctly!

大意题的选项要抓住关键词: C是women's social class; D是class structure of US. 文章谈论的是C的中心词。

deny sb sth，双宾语；
eg: She could deny her son nothing， 她对儿子有求必应

这道题做得慢主要是句式有点复杂，注意what....引导的当成一个名词理解掉。

借助时态考察语意

这个although 很重要，表明不是跟黑洞本身的mass有关系，，而是rediation量导致的问题（解释不通的problem)。如果知道了 原来吸进去的没有那么多，就说得通了

不定式短语和名词的区别

没有evidence 只有论述

E reinforce是一个显然和作者态度不符合的答案