There be侧重存在，一般无生命的用there be；have侧重拥有，有生命的用have
一个国家/城市有多少人用have，China/Shanghai have xx people.
一个城市有几栋楼用there be ，there are 13 tall buildings in Shanghai.
1、D在于主语冗余了，studies已经是第一个句子的主语了，and后面没必要再跟一个主语studies
2、关于D的一般过去时时态，一个句子根据动作发生时间的不同是可以有不同的时态的。I ran yesterday and swim today.
3、show短暂的或表结果的动词，也可以加have，Facts have shown us that he is trustworthy.事实已经表明他是值得信赖的。have done强调show这个动作产生了影响
it weighs only 8.1 grams, far less than……，比较的是8.1 grams，用less
its weight of only 8.1 grams is far lighter than it is for……，比较的是weight这个东西，weight is lighter
B,cameras can capture material at a degree of fidelity like the degree with film, with改成of，这里要把省略部分补足成the degree of film,不是the degree with that film can capture material,因为电影不会捕捉高精度物质，是相机捕捉了高精度物质后呈现在电影里，是电影的高精度
by，介词，
表方式，The house is heated by gas. to travel by bus
表原因，I did it by mistake.
the attorney general accused the bank by failing to honor its promise to its customs,司法部长由于未能履行承诺而起诉银行，
结合最后作者给出explanation可知，extinct carnivores的牙齿碎裂比present-day carnivores的牙齿碎裂更加频繁，是因为行为不同导致，而行为不同的背后原因是以前猎物少捕食者多（either that prey availability was low, at least seasonally, or that there was intense competition over kills and a high rate of carcass theft due to relatively high predator densities.）
be wanting sth表示缺乏，需要某物
如：I am pretty sure that you will be wanting to sleep a lot.
be wanting to do sth 想要做某事
如：They may be wanting to know when you leave for home.
主旨题：根据 The breakage frequencies in the extinct species were strikingly higher than those in the present-day species.这个现象，在解释这个现象的过程中，研究人员拒绝了demographic bias、拒绝了preservations bias, 拒绝了 local bias 。最终认定是因为behaviour differences造成的这个现象
2、for的用法
（1）do sth for sb,为某人做某事，He's waiting for the bus. I do this for you.
（2）do sth for sth,为了某事而做某事，表目的，He went home for his book. She works hard for success.
英语不用for doing sth来表示目的，如He went there to visit her uncle. Wrong: He went there for visiting her uncle. 除非该动词ing已名词化，如He went there for swimming.
（3）表用途，The knife is ended for cutting things.
（4）表原因，Thank you for coming to see me. He can't speak for laughing.
Some individual firms in developing countries have raised their productivity but kept their wages (which are influenced by average productivity in the country's economy) low.
一些发展中国家的个体公司提高了生产力但是把工资压得很低（工资受到这个国的平均生产力的影响）
And although in the past a few countries have deliberately kept their currencies undervalued, that is now much harder to do in a world where capital moves more freely.
尽管在过去一些国家刻意得压低了货币，这种做法在如今资本流动更自由的环境之下越来越难了。
主旨题：reevaluate a traditional idea -Many people believe that because wages are lower in developing countries than in developed countries, competition from developing countries in goods traded internationally will soon eliminate large numbers of jobs in developed countries
许多人相信因为发展中国家的工资更低，来自发展中国家的贸易竞争很快会拿走发达国家的大量工作岗位
直接细节题：
but are the result of changes in Algonquian society brought about by the European-Algonquian fur trade
由A人和欧洲人的fur trade所带来的社会变革的结果，changes的定语就是这题的答案
看了很久终于看出来新观点如何反驳dominant view的了…
The dominant view in recent decades has been that family hunting territories, like other forms of private landownership,
注意other forms of private landownership，言下之意就是家庭狩猎区自身就是私有制度的一种
the differentiating factor between (a) and (d) is the placement of the "such" modifier. "such" should be placed AS CLOSE AS POSSIBLE to the NOUN THAT IS EMPHASIZED in context. （例如in this problem, "such as" is describing the CRITERIA, not the variety.）
“这里such的位置就很好。 a variety of是各种各样的意思，你觉得such all kinds of fruits as apple, pear, and banana通顺吗？肯定不好啊，所以D就不好。一般都是说all kinds of fruits such as...，所以就选A。”
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well副词，prevent the disease well 很好地预防疾病的发生