单项选择题

The passage centers on （）

A．how an undersea volcano broke out
B．how an island rose up in the sea
C．how soil was formed on a new island
D．how life began on a volcano-produced island

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热门试题

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

单项选择题

The construction of the transcontinental railroad took （）

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