Finally, older production technologies often continue to generate toxic wastes that were not regulated when the technology was first adopted. New regulations have imposed extensive compliance costs on companies still using older industrial coal-fired burners that generate high sulfur dioxide and nitrogen oxide outputs, for example, whereas new facilities generally avoid processes that would create such waste products.
第一句话是概括，后面是举例，对氮硫物相关说法：老的还在继续使用，新规规定extensive costs，就是就算罚款也要用

读题时间太长

一直以为plausible是虚假的，这个题目主要是最后一句话unimportant忽视了

Second, it is a more continuous record than that taken from rocks on land.gaps in the sequence=not continuous.
答案都能在题目中找到，重点就是阅读速度和理解力。贯穿上下文的题目并不多，遇到那种可以适度放弃

（1）n是个奇数，所以(n-1)和(n+1)是两个相邻的偶数。两个相邻的偶数，必然有一个可以被4整除、一个可以被2整除，比如2、4、6、8等等。所以(n-1)(n+1)可以被8整除。
（2）n不能被3整除，所以(n-1)和(n+1)必然有其中一个可以被3整除，比如3、4、5、6、7、8、9等等。所以(n-1)(n+1)可以被3整除。
综合上面两个条件，(n-1)(n+1)可以被24整除。来源：CD

目的是表明信用卡标志对 creditcard holder具有影响，不是信用卡标志和付钱多相关。

作者most likely to agree,定位词more inportantly，debate是指文中提到过的controversy，我做这个题的时候人是飘的，没有静心读题，毫无章法。
ADE明显错误，我选择c，但是忽略了C是current

原来c是因为在校外就不能监管得到了，我以为在教室里教会了 即使在家用也会了呢

没有定位到，控制时间就比较紧张，心态不好，需要strengthen

做对了 时间花费太长

however是做“转折，仍然”的意思时是副词，无法连接句子。however做连词的时候意思是“不管怎样”

however 是副词 不是连词

"one of + 复数名词,后面谓语动词用复数" 这个解释不全面
eg, ONE of the many new satellites IS fantastic.
ONE of the many new satelliteS (THAT ARE very huge) IS fantasitic.

若 one of + 复数名词 + V+O, 后面谓语动词用应该用单数 因为主语是one
这道题的情况是 that作定语从句 修饰 satellites 所以此从句的谓语动词是复数

interaction of; effort to do sth

mark一下

在前句出现过的部分可以在后面省略
A: Of all the record companies involved in early jazz, the three most prominent [?] were Columbia, Victor, and OKeh.
D: Columbia, Victor, and OKeh were three most prominent [?] of all the record companies.
Here, it is NOT crystal clear what words are implied within the brackets since no eligible phrase appears earlier in the sentence.

http://www.beatthegmat.com/vr-though-being-tiny-blind-and-translucent-t293895.html

搬运一个感觉比较合理的解释

OG说A会引起歧义，其实是这个意思：
理解1：The nephew...wrote the only eyewitness account of 【the great eruption of Vesuvius in two letters】to the historian Tacitus;
理解2：The nephew...wrote the only eyewitness account of 【the great eruption of Vesuvis】in two letters to the historian Tacitus.
所以提醒我们所有格后面如果还跟有介词，一定要注意分清楚，这个介词是修饰整个句子，作为状语；还是：紧跟所有格后面的那个名词，是整个所有格的一个部分。

less more这种比较词和than搭配而不是和compared to 。C中比较对象是移民到美国和在德国的时候。比较结构中必须判断好比较对象。

想问下which不是有就近修饰的原则吗，那which应该修饰electronic data interchange还是tasks呢