单项选择题

Lava bursts out where there is

A．a crack in the earth.
B．a mountain by the sea.
C．a big fire.
D．steam and gas.
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单项选择题
According to the passage, Vesuvius has caused serious damage
A．six times.
B．seven times.
C．eight times.
D．nine times.
单项选择题
The phrase stay alive in the last paragraph can best be replaced by
A．"burst out".
B．"remain active".
C．"come to life".
D．"throw out lava".
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