不受益就不会本地的基因就不会被稀释，本地基因不会被稀释就不会gene flow,就不会lower fitness，是这样吗？

不太明白～～从本地受益怎么就是前提了呢？不受益就不会lower fitness吗？

一道充分反映GMAC出题思路的SC题

selling是对前面的解释吧然后后面的with又是对selling的解释？

读题不仔细

读题不仔细

读题不仔细

D.can ：able to do
E.possibly：may have capability

【RON对于E的解释】
i think the real issue there is the weird combination of "in fact" and "possibly". after all, if something is just possible, then it's not a fact.
note that, in the correct answer, "possibly" is replaced by "can", which is a fact (i.e., it's factual that the chirping rate can be used as a thermometer, whether or not people actually choose to use it as such).

- the simple present tense join implies that there is some sort of timeless truth about the statement being made. that's the wrong meaning: the sentence is meant to say that the rich nations have begun to do this as a result of current trends.
以上是RON的解释 B出错在1.for doing表达目的不对（在这里他还说到A其实也有些wordy）2.“rich nations...."改变了语义 并不是nations 一起加入slide，而是slide出现后他们join it 3.时态 完成时表达这些公司在这种趋势出现时have begun to do so

'for maintaining competitiveness' is bad idiomatic usage: it's an incorrect way to express intent or purpose.
- 'rich nations join in this downward slide': fatal change in meaning. this wording implies that the rich nations are colluding with each other, metaphorically holding hands, deciding together to become more lax about pollution. (choice a expresses the correct meaning, which is that the slide is happening and that rich nations are individually joining it.)

exhibit 表现出
Prefer a to b/prefer for sth
B里面的expand和include∥❌，很明显他们之间有逻辑关系！

我想这题应该要靠前面说过labor cost 和labor rate不一样， cost的高低会被很多因素影响，比如生产率，员工的talent等等因素，所以衡量比较labor rate更方便，不用评估其他的因素

appreciative; appreciable 词义

好吧time是时代。。

定位在The very techniques these historians used to uncover mass political behavior in the nineteenth century United States - quantitative analyses of election returns, for example--were useless in analyzing the political activities of women, who were denied the vote until 1920.

前面出现了athletes representing the United States in the Olympics。所以e完美了。.。。

确定them是运动员，那么e里面这个运动员是所有格形式，不是不可以用代词吗？god why？

gmat里的that不是不能单独指代吗？