前提：没电脑的人不会买电脑，不论价格多少
结论：引进新的电脑不会增加K的家庭拥有电脑的数量
问加强
有电脑的人也不买

否定性副作用不存在的原因是什么

整个文段是说从员工的角度出发，低工资没法生活，政府让公司提高最低工资标准，公司说不能提高，因为提高了之后付不起那么多钱去雇佣相同数量的员工，可能员工数量就要减少才能付得起，所以提高最低工资会导致失业率升高。A在说招聘员工花的钱和提高最低工资花的钱一样多，攻击了这个推理的弱点（提高了最低工资就一定要裁员，裁员之后又要重新招人，一定要裁员吗？一定是赔钱的买卖吗？）。
前提：为了能让低工资人群活下去
结论：政府要提高最低工资
方案的副作用：可能是增加失业率
问题是问方案的副作用在什么情况下不存在

model本身没问题，有问题的是several studies忽视了跨国因素使得model与实际情况不一致。作者没有质疑model，而是指出两种研究的不同结果，最终还是说如果能employ broader geographic units of analysis的话，studies have found more support for the density dependence model。

如果有了定价系统，交通拥堵会减少是B项的否命题，原命题对否命题不一定对

这题主要考查的是从句和名词的区别
A.similarity be explained as a movement,但是句义上similarity肯定不能被一个movement解释，应该是这个movement导致了这样的一个similarity
B.explanation is as a movemnt,同A,解释不可能是一个movement
C.同A
D.one explaintion is that。。。That引导的从句很清晰的反映出了一个事件是导致了similarity
E.句子重点错误，而且with one explanation for this表述冗杂

A选项，those most important，those指代benefits，而most important修饰those，因而在此可以作为pick的宾语。B选项，them和themselves属于同一个代词，在一个句子中同一个代词须指代相同的对象，而此句them指代benefits，themselves指代employees，错误。C选项，整个句子在逻辑意义上是offering和letting存在因果关系，但个人认为这不是好的做题的着手点。C选项中pick the most important，the most important是形容词，不能作为pick的宾语，从此着手会更容易解题。而使用them或themselves指代employees，个人认为都是可以的。

这篇真心难。。。

这道题应该算难题了吧，因果联系感觉好不明显，即使把答案和文章链接到一起，也不是特别能让人信服，希望不会遇到这种题目吧。。。

consider的用法，比较的对象。

此题考点是时态的掌握，在今年的前三个月这个提示下，应该意识到用have done，而不是过去式和过去完成，after 后面跟v-ing是对的，主语是profit，所以可以主动falling。

Halley's comet caused such a worldwide sensation (in no other historical sighting) as (in its return of 1910–1911) as Halley's Comet caused in its return in 1910-1911.
做题的难点一个在于句意的理解，一个是句子结构，即使可以看出倒装还是很难选择正确的选项。

总路程除以总时间等于平均速度

e.g.,

This book is hard for me to read.
(I experience difficulty in reading this book.)

It is difficult for Liz to talk to her ex-husband.
(liz has trouble talking to her ex. we don't know whether the converse is true.）

in the construction "it is (adjective) for XXXX to (verb)", the adjective describes what XXXX experience(s) in trying to (verb).
so, choice E is saying that the appliances themselves have to spend a lot of money "to be bought on credit". well, that doesn't make any sense.

rise不及物，raise及物

i also find something a bit awkward about the use of "unable" to describe something that's not actually an inability of the subject.

here's what i mean:

this plant is unable to perform photosynthesis.
legitimate, because this actually describes an inability of the plant itself.

1. breakage frequencies in the extinct species were strikingly higher than those in the present-day species.
2. more contact between the teeth of predators and the bones of prey due to more thorough consumption of carcasses by the extinct species. Such thorough carcass consumption implies to the researchers either that prey availability was low。
the answer need to refer to the two items in the passage.

There are two reasons: Either... or. Because of or becasue , 第一个because 和第二个的forces 平行， 所以第一个because 后面要跟句子。

文本就没理解。。。。。醉了