单项选择题

The best title for this passage would be ______.

A．Settlements Spread Westward
B．The Coast-to-Coast Railroad: A Vital Link
C．American Railroad History
D．The Importance of Trains in the American Economy

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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