2. D)这是一道推论题。可用排除法做此题。根据文章第六行至第七行rather they became supplements or feeders和第十行至第十三行Wagon freighters continued operating throughout the 1870s and 1880s and into the 1890s. Although over constantly shrinking routes, and coaches and wagons continued to crisscross the West wherever the rails had not yet been laid.可知随着铁路线的不断延伸,马车货运的路线日益减少,虽然马车货运经营者们继续在西部发展货运线路,但是它们只是铁路运输的补充。因此选项A他们发展了有竞争性的线路可以排除。而选项B、C文中根本没有提及。故只有选项D为正确答案
3. D)根据the Sierra Nevada所在句可知作者提到它是因为它是修建横跨东西铁路的一个巨大的障碍,故D为正确答案。
4. B)Subsidy意为补助金,津贴,与financing意义相符。
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