请教三道GRE填空的解题思路,希望有详解~Scholars' sense of the uniqueness of the central concept of "the state" at the time when political science became an academic field quite naturally led to striving for a correspondingly ___ mode

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请教三道GRE填空的解题思路,希望有详解~
Scholars' sense of the uniqueness of the central concept of "the state" at the time when political science became an academic field quite naturally led to striving for a correspondingly ___ mode of study.
A) thoroughB) distinctiveC) dependableD) scientificE) dynamic
From the outset,the concept of freedom of the seas from the proprietary claims of nations was challenged by a contrary notion -- that of the ___ of the oceans for reasons of national security and profit.
A) promotionB) explorationC) surveyingD) conservationE) enclosure
The National Archives contain information so ___ that researchers have been known never to publish because to publish because they cannot bear to bring their studies to an end.
A) divisiveB) seductiveC) selectiveD) repetitiveE) resourceful

1.B.
这里的关键是uniqueness和an academic field,既然是一个专业领域,而且有其特殊性,thorough,dependable,dynamic肯定不对.剩下的选择中,distinctive显然与uniqueness更相符.
2.E
首先注意前后两个观点是相反的(contrary),freedom of the seas要求自由航行,后一观点肯定是要限制.ABC肯定不对,D,E中,D与national security不符(这里national security显然比profit更重要).
3.B
一般研究者最终还是希望发表自己的结果,
AC都不是不完成研究的理由.
D不对,除非研究者有意浪费时间
A表示不想对社会造成坏影响,但句子里看不出没有这个意思