单项选择题

A．control
B．support
C．agreement
D．criticism
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单项选择题
When lava cools, it becomes
A．liquid.
B．water.
C．smoke.
D．hard.
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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