【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.)
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.
and citations per semiconductor patent did decline during the 1980s. This decline in quality may be related to
质量在1980s有下降说明从高到底。。
C❌是因为原文是专利的引用，不是专利质量的引用。。。。
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一道充分反映GMAC出题思路的SC题
为什么这么说？
know和assume均属于看法类动词，应用不定式的形式。