单项选择题

According to the passage, the island got its first soil from （）

A．sea waves
B．the sand brought by the wind
C．its own rock
D．cool rains

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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 labourers from Europe
D．encouraged people to travel all over the country

单项选择题

What most likely made people think about a transcontinental railroad（）

A．The possibility of government support for such a task.
B．The need to explore Utah.
C．The need to connect the east coast with the west.
D．The need to develop the railroad industry in the west.