单项选择题

When lava cools, it becomes

A．liquid.
B．water.
C．smoke.
D．hard.
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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.
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.
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