GRE填空考察的就是整体逻辑语言的能力，考生的任务就是找出句子成分间的逻辑关系，并选择一个合理且必然的选项。
句子成分间的逻辑关系对解题起着至关重要的作用，它们常常由一些明显的关键词提示。
最重要的几种逻辑关系：
因果关系：because, in that, for, therefore, thus, accordingly, consequently, hence, given, so…that, so…as to, when…then, as long as, in order to……
转折关系：albeit, but, although, despite, however, in spite of, nevertheless, notwithstanding, while, whatever, regardless, even though, even if, yet……
对比关系：in contrast, on the contrary, far from, on the other hand, rather than, instead of, not…but, paradoxically, ironically, surprisingly, unexpectedly……另外还有时间的不同体现相反的关系等等
填空题的句子常出现陌生的专业术语，晦涩的思想观点等，但对解题并不构成真正的障碍。因为题目本身往往提供了足够的内容的重复线索帮助你找到正确的答案。
e.g.
Melodramas, which presented stark oppositions between innocence and criminality, virtue and corruption, good and evil, were popular precisely because they offered the audience a world _____ of _____.
A. bereft theatricality
B. composed adversity
C. full circumstantiality
D. deprived polarity
E. devoid neutrality
题目的主干要我们填Melodramas提供给观众一个怎样的世界，同时又告诉我们它们表现了无辜与罪恶，美德与堕落之间的刻板对立，所以我们不需要知道Melodramas是什么东东就可以判断它们提供给观众的是一个刻板对立的世界，五个选项中只有E选项“全无中立的世界”表达了这个意思。
The new biol**ical psychiatry does not deny the contributing role of psychol**ical factors in mental illnesses, but posits that these factors may act as a catalyst on existing physiol**ical conditions and _____ such illnesses.
A. disguise B. impede C. constrain D. precipitate E. consummate
这道题粗看起来内容十分专业，空格要求填factors 对such illnesses 有什么样的动作。其实句子中有一个明确的重复线索，factors 起到了一个催化剂的作用，所以空格中填入一个表达催化意思的词语，就一定是正确选项。表示催化的感觉的词只有D项：precipitate。
