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  3. The historian Frederick J. Turner wrote in the 1890’s that the agrarian discontent that had been developing steadily in the Unit

The historian Frederick J. Turner wrote in the 1890’s that the agrarian discontent that had been developing steadily in the Unit

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问题     The historian Frederick J. Turner wrote in the 1890’s that the agrarian discontent that had been developing steadily in the United States since about 1870 had been precipitated by the closing of the internal frontier that is, the depletion of available new land needed for further expansion of the American farming system. Actually, however, new lands were taken up for farming in the United States throughout and beyond the nineteenth century. (46)In the 1890’s, when agrarian discontent had become most acute, 1,100,000 new farms were settled, which was 500,000 more than had been settled during the previous decade. After 1890, under the terms of the Homestead Act and its successors, more new land was taken up for farming than had been taken up for this purpose in the United States up until that time. (47)It is true that agricultural practices had become sufficiently advanced to make it possible to increase the profitability of farming by utilizing even these relatively barren lands.
    The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance of changes in the conditions and consequences of international trade that occurred during the second half of the nineteenth century. (48)By about 1870 improvements in agricultural technology made possible the full exploitation of areas that were most suitable for extensive farming on a mechanized basis. Huge tracts of land were being settled and farmed in Argentina, Australia, Canada, and in the American West, and these areas were joined with one another and with the countries of Europe into an interdependent market system. (49)As a consequence, agrarian depressions no longer were local or national in scope, and they struck several nations whose internal frontiers had not vanished or were not about to vanish. Between the early 1870’s and the 1890’s, the mounting agrarian discontent in American paralleled the almost uninterrupted decline in the prices of American agricultural products on foreign markets. (50)Those staple-growing farmers in the United States who exhibited the greatest discontent were those who had become most dependent on foreign markets for the sale of their products. Insofar as American had been deterred from taking up new land for farming, it was because market conditions had made this period a perilous time in which to do so.

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答案的确，农业耕作能力已经得到足够的提高，因此即使是利用这些相对贫瘠的土地来提高耕作的收益也是可能的。
解析 注意本句的主干结构为以it is true that引出的从句。句中it是形式主语。
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考研英语一

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