单项选择题

The major problems with America's railroad system in the mid 19th century lay in （）

A．poor quality rails and unreliable stopping systems
B．lack of financial support for development
C．limited railroad lines
D．lack of a transcontinental railroad

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热门试题

单项选择题

The building of the first transcontinental system（）

A．brought about a rapid growth of industry and farming in the west
B．attracted many visitors to the construction sites
C．attracted laborers from Europe
D．encouraged people to travel ail over the country

单项选择题

The construction of the transcontinental railroad took （）

A．9 years
B．4 years
C．7 years
D．3 years