1. The author refers to the impact of railroads before the late 1860s as limited because ____
A. the track did not take the direct route from one city to the next
B. passengers and freight had to transfer to other modes of transportation to reach western destinations
C. passengers preferred stagecoaches
D. railroad travel was quite expensive
2. What can be inferred about coaches and wagon freighters as the railroad expanded?
A. They developed competing routes.
B. Their drivers refused to work for the railroads.
C. They began to specialize in private investment.
D. There were insufficient numbers of trained people to operate them.
3. Why does the author mention the Sierra Nevada in line 17?
A. To argue that a more direct route to the West could have been taken.
B. To identify a historically significant mountain range in the West.
C. To point out the location of a serious train accident.
D. To give an example of an obstacle faced by the central pacific.
4. The word subsidy in line 27 is closest in meaning to _____.
A. persuasion B. financing C. explanation D. penalty
答案解析
1. B)根据文章前五句可知,在十九世纪六十年代晚期前铁路在美国的影响是有限的limited,当时铁路只从美国东部修到了美国中部,运到美国西部地区的货物只有在铁路的尽头endoftrack改用其他的运输方式,比如:汽船、马车等,它们的运输效率可想而知。故选项B为正确答案。
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