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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According to the passage, a volcano sends out

A．boiling water.
B．boiled water.
C．melted rock.
D．melted ice.