题目解析：
【题目翻译】：根据第1段，是什么首先使巴西人认真考虑试图从葡萄牙获得独立？
A：葡萄牙对拥有海外殖民地的兴趣下降
B：葡萄牙为了自己的优势获得巴西的政治和经济控制权
C：当时西班牙美国部分地区正在实现独立
D：葡萄牙对巴西控制经济的努力的反应
【判定题型】：题目问的是文章中的具体细节信息，故根据题目问法可以判断本题为事实信息题。
【关键词定位】：根据关键词,定位到paragraph 1 第2句，“The idea of Brazilian independence first arose in the late eighteenth century as a Brazilian reaction to the Portuguese policy of tightening political and economic control over the colony in the interests of the mother country.”这句话中说，葡萄牙为了自己国家的利益，加强对巴西殖民地政治和经济的控制，而巴西独立的想法正是对葡萄牙这种做法的反抗。
【逻辑分析】：关键词所在句子表明葡萄牙为了自己国家的利益，加强对巴西殖民地政治和经济的控制。与选项B葡萄牙为了自己的优势获得巴西的政治和经济控制权意思相同。
【选项分析】：
B选项：葡萄牙为了自己的利益控制巴西政治和经济，即巴西独立想法的根由。
A选项：葡萄牙对海外殖民地的兴趣减弱。错误，因为第一段未提及该信息。
C选项：当时在西班牙美洲的一些地区，独立运动持续进行。错误，第一段中只有第1句提到了西班牙美洲地区无政府状态、经济混乱和军事破坏的状态，但这是为了与巴西独立
In contrast to the political anarchy, economic dislocation, and military destruction in Spanish America, Brazil's drive toward independence from Portugal proceeded as a relatively bloodless transition between 1808 and 1822. The idea of Brazilian independence first arose in the late eighteenth century as a Brazilian reaction to the Portuguese policy of tightening political and economic control over the colony in the interests of the mother country. The first significant conspiracy against Portuguese rule was organized from 1788-1799 in the province of Minas Gerais, where rigid governmental control over the production and prices of gold and diamonds, as well as heavy taxes, caused much discontent. But this conspiracy never went beyond the stage of discussion and was easily discovered and crushed. Other conspiracies in the late eighteenth century as well as a brief revolt in 1817 reflected the influence of republican ideas over sections of the elite and even the lower strata of urban society. All proved abortive or were soon crushed. Were it not for an accident of European history, the independence of Brazil might have been long delayed.
