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 construction of the transcontinental railroad took （）

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

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