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.
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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".
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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