DS 要时刻提醒自己 看清楚题目问的是什么 有时候不需要算出具体数值

PRS = QPR + PQR
所以只要知道QPR的角度即可求处PRS 比PQR 大多少
看清楚指的是什么角

PRS = QPR + PQR
所以只要知道QPR的角度即可求处PRS 比PQR 大多少
看清楚指的是什么角

DE本质前后没有强烈的因果关系

这答案怎么看都不对啊，D选项除了油漆其他的环境影响都不大，那就是油漆被环境影响的大喽。那这不是和题干是反的么

so...as to...与so...that...表达的意思一样，均为“太…以至于…”，一种因果关系。他们的区别在于，so...as to...用于主语和to后面的动作的发出者一致时，而so...that...中，主语与that之后的主语不需要一致。

但“经济变化是缓慢的”这件事导致的结果直接是“经济变化 是 难以辨别的”，而不是 “可以是”。也不是“没有能力被辨别”。

research在本选项中是及物动词，身后直接加宾语即可，不用再加介词短语（只有不及物动词才需要加介词短语来构成及物动词短语）。
while是连词，身后应该加完整的句子（表伴随状语时可以加分词短语），不能只加介词短语。

If these doctors drank more coffee, their likelihood of having coronary disease was greater.
可能性并非拥有的，而是客观存在的，所以是ing

解释的不对，不要看
attribute to和result重复

proposed：计划的，提议的。
current one与proposed speed limit对应

为什么study不能explain why 呢...？

解释都好生硬啊

Bi, can you stop justifying your ignorance?
According to the context , we can hardly assume the very intention of human being is to encounter more prey, nor should we justify the usage of "HAD done" .
In case of any refutation, here is the origin.
The research, which was published in the Feb. 9 issue of the journal Science, has implications both for the modern-day debate over reintroduction programs and for a historical debate over what happened 10,000 to 50,000 years ago, when one particular predator, humans, expanded its territory and encountered large numbers of native prey. Some experts think that a ''blitzkrieg'' of killing by advancing humans contributed to the extinctions of many large animals in that era.

See, It's an article from NY Times. what I wanna say is stop offering your misguidance and misinterpretation!

由并列连词and连接的两者平行的现象。实际上，这是一个省略和倒装的现象，还原后则有：
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
划线部分均为省略内容。介词to倒装在了what extent身前。

needs和wants都是名词。。。我说做题的时候哪哪儿都不对

A中itself做了which同位语
B中itself做了adapting的宾语

by the animal overcompensating中的by是介词，身后只能添加名词短语

300/10% 大于1000，所以 the amount of sales 一定大于1000.

这个好难把握。。

1.by 指的是以...方式，逻辑不符，排除AB
2.fail to do; the failure to do, 排除D
3. fail “in” ..... 后面跟失败的领域，范畴，活动； 意思是 “在....地方失败“